# Timeline of Welsh history

This is a timeline of Welsh history, comprising important legal and territorial changes, and political events in Wales.

## Mesolithic and Neolithic periods

| Year | Event |
| c. 31,000 BC | Earliest reliably-dated "modern human" burial with artefacts, first discovered in the 1820s on the Gower in Swansea. After the Red Lady of Paviland bones were recalibrated in 2009, the (male) Homo sapiens bones were determined to be from 33,000 years ago. |
| c. 6000 BC | Following the end of glaciation and sea level stabilisation, Wales becomes roughly the shape it is today and is inhabited by Mesolithic hunter-gatherers. |
| c. 4000 BC | The earliest farming communities become established in Wales, marking the beginning of the Neolithic period. Megalithic tombs still survive from this period, such as the Pentre Ifan Dolmen in Pembrokeshire. |

## Bronze and Iron Ages

| Year | Event |
| c. 2500–2100 BC | Metal tools first appear, as copper ores are extracted from deep open cast mines in central and northern Wales. Implements are initially made from copper, followed by bronze (made by adding tin and lead to copper). |
| c. 2500–700 BC | Wales is part of Bronze Age Britain, a maritime trading culture, selling tin, lead, iron, silver, gold, pearls, corn, cattle, hides, skins, fleeces, trained hunting dogs and slaves, and buying ivory, amber, glass vessels and other luxuries;$^{:12}$ bronze axeheads from this area have been found on the coasts of Brittany and Germany. |
| c. 650 BC | Implements start to be produced from iron, the earliest examples are believed to come from Llyn Fawr in South Wales. |
| c. 400 BC | Iron Age settlements emerge in Wales, two of the earliest being Castell Odo, a small hillfort near the tip of the Llŷn Peninsula and Lodge Wood Camp, above the later Roman fort at Caerleon. |
| c. 150 BC | Gold coins are being minted at least as early as this date, imitating Macedonian designs.$^{:12}$ |
| 54 BC | Tacitus later (1st century AD) records that Cymry (Welsh people) assisted in repelling Julius Caesar's second invasion. |

## 1st century

| Year | Event |
| c. 25–75 | Celtic chariot burial in southern Britain discovered in Llanstadwell, Pembrokeshire, in 2018 |
| 48 | The Roman conquest of Wales begins as the Deceangli tribe in the northeast submits to Publius Ostorius Scapula |
| 51 | Caratacus, a defeated chieftain from east England, encourages the Silures and Ordovices to attack Roman territories, ultimately unsuccessfully; he is betrayed by the Brigantes and taken to Rome as a prisoner |
| 52 | A Roman legion, probably Legio XX Valeria Victrix, is defeated by the Silures |
| c. 75 | The Silures have been defeated; Romans establish Venta Silurum, a market town in the Roman province of Britannia; the modern village of Caerwent in Monmouthshire is built around the Roman ruins; Roman fortress at Caerleon is established for the Legio II Augusta |
| 77 | Roman general Gnaeus Julius Agricola subjugates the Ordovices with "much slaughter" |
| 78 | Gaius Suetonius Paulinus completes the Roman conquest of Wales, ending with his campaign to capture Anglesey; the conquest has involved at least thirteen campaigns, up to 30,000 soldiers and, due to Wales's particular terrain, the development of new tactics which were subsequently adopted in other parts of the empire |

## 2nd century

| Year | Event |
| c. 100–200 | Roman rule over Britannia is less evident in Wales than in other parts of Britain; there are few Roman settlements, but a number of roads, camps and forts; the Romans exploit resources such as metal ores, and to a lesser extent coal |
| c. 150 | According to Ptolemy, Wales was populated by five indistinct peoples, mostly of Celtic origin: Ordovices, Silures, Demetae, Deceangli and Gangani |
| c. 162 | Llandaff was probably the site of the first Christian church built in Wales$^{:44}$ |

## 3rd century

| Year | Event |
| — | Evidence of Christianity in Gwent |
| — | Hoard of more than 3,000 Roman coins buried in a ceramic pot in Powys, discovered in 2011 |
| c. 280 | Vines introduced into Britain, including Glamorganshire; also first established around this time, fruit tree, vegetable and game species not previously indigenous$^{:46}$ |

## 4th century

| Year | Event |
| 311–313 | The edicts of Serdica and Milan allow Christians throughout the Empire to worship without restriction; there had been periods of persecution in Wales, including two martyrdoms: Julius and Aaron |
| 350–369 | Influx of settlers from Ireland take advantage of soft Roman rule in Wales |
| 383 | Effective end of Roman rule in Wales; de facto Roman ruler Magnus Maximus leaves Wales defenceless when he embarks on a military campaign with considerable forces, and remains on the continent with his troops |
| c. 389 | Irish, Scots and Saxon invaders begin to fill the vacuum left by Magnus Maximus and his garrison |

## 5th century

| Year | Event |
| 410 | Roman garrison withdrawn from Britain, followed by the emergence of Welsh kingdoms, principally Gwynedd (north), Demetia (south, subsequently Dyfed) and Powys (east) |
| c. 430 | Germanus of Auxerre promotes Christianity more widely in Wales and, as a former general, puts himself at the forefront of a British force in a confrontation with raiders near Mold |
| c. 450 | Cunedda Wledig (possibly the grandson of a Roman or Romano-Briton with military rank on the border with Scotland) comes "from the north" and founds Gwynedd by driving out the Irish settlers |
| c. 480 | Tydfil, later Saint Tydfil—a daughter of Brychan, king of Brycheiniog (later Brecknockshire)—is murdered at Merthyr |
| c. 490 | Dubricius is appointed archbishop of Caerleon and Llandaff; he founds several colleges, including asylums for the aged and schools for the young |

## 6th century

| Year | Event |
| c. 500–542 | The supposed time of the legendary King Arthur, of Welsh parentage and crowned at Caerleon, referred to by early writers such as Nennius, Geoffrey of Monmouth and many others, but considered by more modern historians as a combination of "monkish legends and chivalrous fiction" |
| c. 500–589 | The time of Dewi ap Sanctus (grandson of Ceredig, founder of Ceredigion), who later became Saint David, patron saint of Wales |
| 519 | Bishop Dubricius presides over the Synod of Llanddewi Brefi, during which he resigns and recommends that Bishop Dewi succeed him; this is approved |
| c. 522 | Dewi moves the seat of the primacy to Mynyw, where the see became known as St David's, but the settlement was called Menevia at least until the 13th century, and later became the city of St David's |
| 547 | Death of Maelgwn Gwynedd, king of Gwynedd, known for funding the foundation of Christian churches throughout Wales; Maelgwn may have died of the bubonic plague, a pandemic that spread across Europe and beyond in the early 540s, mostly via trade routes |
| c.560 | Death of Bishop Dewi. His episcopal see at Menevia is renamed Ty Ddewi (The House of David) in his honour |

## 7th century

| Year | Event |
| c. 600 | The terms Cymry (Welsh people) and Cymru (Wales), as opposed to other Celtic peoples and regions, already in use as self-identifiers |
| 615/616 | Battle of Chester between Anglo-Saxons and native Britons |
| 630 | Welsh/Mercian alliance between King Cadwallon of Gwynedd and Penda of Mercia defeats army of King Edwin of Northumbria at the Battle of Cefn Digoll (or "Battle of the Long Mynd") at Long Mountain near Welshpool |
| 633/4 | Cadwallon ap Cadfan, king of Gwynedd, dies in battle in the north of England |
| c. 655–682 | Reign of Cadwaladr ap Cadwallon, king of Gwynedd; 660 is the earliest date recorded$^{:3}$ in the 14th century Brut y Tywysogion (Chronicle of the Princes), an important Welsh history source |

## 8th century

| Year | Event |
| 700–750 | At the height of its powers, Mercia expands westwards to the Dee, Wye, and Severn rivers, at the expense of the Welsh kingdom of Powys; forced back into the upland regions, the Welsh launch a series of raids throughout the late 7th and early 8th centuries, in a bid to regain the rich farming territory of the lowlands.$^{:108–117}$ |
| c. 753 | An invading army from Wessex is beaten back by the Welsh at Hereford$^{:113–114}$ |
| c. 754 | Death of king Rhodri Molwynog, whose lineage is unclear, and whose predecessor and date of succession are not known; the reign of king Rhodri's successor, Cynan (probably Rhodri's son), was one of incessant warfare; Rhodri may have been succeeded by Caradog ap Meirion, or Caradog may have been a district ruler$^{:115–116}$ |
| c. 755–794 | Offa of Mercia and Cynewulf of Wessex campaign vigorously along the length of the border with the Welsh kingdoms, causing the Welsh to lose lands they would never recover and largely establishing the eastern borders of Wales that exist today; internal Welsh strife continues$^{:114–117}$ |
| c. 757–796 | Offa's Dyke is built along the Wales–England border to mark the boundary between Anglian Mercia and the Welsh kingdom of Powys; however, radiocarbon dating of samples taken from excavations in 2014 reveal that it may have been constructed much earlier than this, and over an extended time period |
| 768 | The Welsh church adopts the Catholic method of calculating Easter through the efforts of bishop Elfodd$^{:114}$ |
| 795/6 | Battle at Rhuddlan Marsh, between the Saxons and Welsh; there is confusion between possible battles at Rhuddlan Marsh (Denbighshire) in 795 and Rhuddlan (Flintshire) in 796 |
| c. 798 | When Caradog of Gwynedd and Meredydd of Dyfed die at the hands of the Mercians, Cynan ap Rhodri becomes the next king of Gwynedd$^{:116}$ |

## 9th century

| Year | Date | Event |
| 825 | | Egbert of Wessex defeats the Mercians and demands sovereignty over Wales |
| c. 828 | | Nennius, a 9th-century Welsh monk, is thought to have written Historia Brittonum, a history of the Celtic Britons, although some experts argue that the work was written anonymously |
| 844 | | Rhodri ap Merfyn (later known as Rhodri the Great) becomes King of Gwynedd, Powys and Deheubarth by right of succession, uniting the three kingdoms under one rule |
| c. 873 | | When Rhodri the Great dies fighting the Saxons on Anglesey, his three eldest sons become regional rulers: Cadell in Seisyllwg (mainly Ceredigion), Anarawd in Gwynedd and Merfyn in Powys$^{:15}$ |
| 877 | | Cadell ap Rhodri invades Powys, capturing Merfyn's territory$^{:17}$ |
| c. 885 | | Several Welsh kings submit to Alfred the Great's lordship; Asser, a Welsh cleric, is invited to join Alfred in Wessex; in 893, Asser writes a biography of Alfred |
| 892 | | Anarawd ap Rhodri takes over Ceredigion and attacks Dyfed; Merfyn ap Rhodri is killed by his own men$^{:19}$ |
| 893 | (spring) | The Battle of Buttington ends in victory for a combined Anglo-Saxon and Welsh force against the Danish Vikings; the Buttington Oak, believed to have been planted around this time to commemorate the battle, survives until February 2018 |
| 893 | (autumn) | Danish Vikings occupy the town of Chester, but when Alfred the Great cuts off their food supplies, they move west and carry out raids in north Wales before returning to Essex |

## 10th century

| Year | Event |
| 900 | Death of Cadell ap Rhodri, king of Seisyllwg; Anarawd ap Rhodri becomes ruler of most of Wales, being the last to survive of Rhodri the Great's three eldest sons$^{:21}$ |
| 904 | Hywel ap Cadell (grandson of Rhodri The Great) marries Elen, daughter of Llywarch ap Hyfaidd, the late king of Dyfed, thus inheriting the kingdom$^{:21}$ |
| 913 | Death of Hywel's uncle, Anarawd ap Rhodri$^{:21}$ |
| 920 | Hywel ap Cadell unites the kingdoms of Dyfed and Seisyllwg, to create the new realm of Deheubarth ("southern district") |
| c. 926 | Hywel convenes a council from all parts of Wales to establish a set of Laws for the whole country; he takes the transcript to Rome and obtains the Pope's approval |
| 928 | King Æthelstan of England asserts authority over the Welsh kings, and fixes the border between England and Wales at the River Wye; this may have been the first time a border dispute (involving the Welsh in the Witangemot) was settled by discussion, rather than by war |
| 943 | Hywel ap Cadell (known by this time as Hywel Dda or "Hywel the Good") assumes control of Gwynedd after a joint Danish and Saxon incursion leads to the death of their king and his brother; Hywel eventually extends his rule to most of Wales |
| 948 | Death of king Hywel Dda, followed by several decades of inter-family warfare, interspersed with battles with the Saxons and Danes$^{:25}$ |
| 950 | Hywel Dda's nephews, Iago ab Idwal and Ieuaf ab Idwal, reclaim the kingdom of Gwynedd by driving out their cousins at the Battle of Carno$^{:25}$ |
| 952–954 | Territorial struggles continue between the sons and nephews of Hywel Dda, ending in defeat for the southern princes at a major battle near Llanrwst$^{:25–27}$ |
| 969 | Iago ab Idwal imprisons his brother Ieuaf, then continues to rule Gwynedd unimpeded for the next decade$^{:33}$ |
| 972 | King Edgar of England comes to Chester in person to broker peace between the regional kings, but the conflicts resume after his departure |
| 979 | Iago ab Idwal is defeated in battle by his nephew Hywel ap Ieuaf, who becomes the next king of Gwynedd$^{:33}$ |
| 985 | After the death of Hywel ap Ieuaf, his brother Cadwallon ab Ieuaf takes on the rule of Gwynedd for a brief period$^{:37}$ |
| 986 | Maredudd ab Owain captures the kingdom of Gwynedd, which is later annexed with Deheubarth; Danes invade in the south$^{:37}$ |
| 987 | After carrying out several major raids on Wales in previous years, Norse king Godfrey Haroldson takes two thousand captives from Anglesey for ransom |
| 996 | Vikings sack St David's in Pembrokeshire, and murder the bishop, Morgeneu$^{:43}$ |
| 999 | Cynan ap Hywel becomes king of Gwynedd$^{:43}$ |

## 11th century

| Year | Date | Event |
| c. 1000 | | Aeddan ap Blegywryd subjugates north Wales; the hereditary heir, Iago, flees to Ireland; Cynan ap Hywel, though supported by Irish Danes, fails to recover his possessions |
| 1005 | | On the death of Cynan, the pretender Aeddan is ruler of Gwynedd |
| 1018 | | Llywelyn ap Seisyll, with distant claims to Gwynedd and Deheubarth, defeats Aeddan (who is killed along with his four sons) and takes control of the kingdoms of Gwynedd and Powys |
| 1022 | | Llywelyn ap Seisyll defeats the pretender Rhain ("the Irishman"), who claimed to be a son of Maredudd ab Owain, at Abergwili and takes control of the south |
| 1023 | | On the death of Llywelyn ap Seisyll, the rule of Gwynedd and Powys passes to Iago ab Idwal ap Meurig who is descended from the ancient dynasty |
| 1039 | | Iago ab Idwal ap Meurig is killed by his own men, and replaced as ruler of Gwynedd and Powys by Gruffydd ap Llywelyn (King Llywelyn ap Seisyll's son, and great-great-grandson of Hywel Dda) |
| 1055 | 24 October | Gruffydd ap Llywelyn sacks Hereford, one of several territories that he is able to seize in Wales and along the border with England |
| 1056 | 16 June | Gruffydd ap Llywelyn defeats an English army at the Battle of Glasbury (Claftbyrig), near Hereford; around this time, he begins to be recognised as the true King of Wales |
| 1062–1063 | | English nobleman Harold Godwinson (who will later become the last Anglo-Saxon king of England) leads a series of campaigns against Gruffydd ap Llywelyn |
| 1063 | 5 August | Death of Gruffydd ap Llywelyn, after which the Welsh kingdoms are ruled separately for a brief period prior to the Norman invasion of Wales; Bleddyn ap Cynfyn becomes king of Gwynedd |
| 1067 | | Gwent is invaded by William FitzOsbern, 1st Earl of Hereford and his followers, and becomes the first of the Welsh kingdoms to be overrun following the Norman conquest of England the previous year |
| 1070 | | Bleddyn ap Cynfyn becomes king of both Gwynedd and Powys after the Battle of Mechain |
| 1075 | | Death of Bleddyn ap Cynfyn leads to a civil war in which the Normans take the opportunity to seize lands in northern Wales |
| 1081 | | Gruffudd ap Cynan becomes king of Gwynedd following the Battle of Mynydd Carn, but is captured and imprisoned by Norman invaders soon afterwards; William the Conqueror leads a Norman army into Deheubarth, and worships at the shrine of St David |
| 1088–1092 | | Lordships of Welsh lands apportioned to Normans and their Welsh allies; Normans accelerate building or strengthening castles across the country$^{:73–77}$ |
| 1094–1098 | | Welsh revolt against Norman rule leads to territories being regained by the Britons; William II of England attempts to suppress the revolt in north Wales with little success$^{:81–85}$ |
| 1098 | June/July | Shortly after capturing Anglesey from the Welsh, the Normans are defeated at the Battle of Anglesey Sound and forced to retreat, paving the way for the return of the exiled Gruffudd ap Cynan$^{:85}$ |
| 1099 | | Gruffudd ap Cynan escapes from imprisonment again and rules Anglesey with the consent of the Normans |

## 12th century

| Year | Date | Event |
| 1100 | | With the death of William II, much of Wales is under Welsh rule but, with constant struggles for local control, there is no cohesive national identity |
| 1102–1113 | | Period of violent power struggles for regional control between the English crown, under the new King Henry I, and Welsh leaders such as Iorwerth ap Bleddyn, Prince of Powys, and his brothers Cadwgan and Maredudd$^{:87–95}$ |
| c. 1106 | | Construction begins on Ogmore Castle in Glamorgan, one of the earliest Norman stone castles in South Wales |
| 1111–1114 | | Normans move into south and north Wales; peace is agreed between King Henry I and Gruffudd ap Cynan of Gwynedd; Owain ap Cadwgan is knighted by King Henry I for his service in Normandy$^{:95–97}$ |
| 1115–1130 | | A period of inter-family differences and rights of succession, mainly in the south and east (but to some extent in Gwynedd), are marked by warfare and brutality; Owain ap Cadwgan is killed in battle and most of Powys passes to his uncle, Maredudd ap Bleddyn$^{:97–111}$ |
| c. 1123 | | Saint David is canonised by the Holy See |
| 1131 | 9 May | Tintern Abbey, the first Cistercian monastery in Wales, is founded in Monmouthshire |
| 1132 | 9 February | Death of Maredudd ap Bleddyn; he is succeeded as ruler of Powys by his son Madog ap Maredudd |
| 1136 | 1 January | The Welsh revolt against Norman occupation continues with a defeat of Norman forces at the Battle of Llwchwr (Battle of Gower) |
| 1136 | September/ October | Owain ap Gruffudd, allied with Gruffydd ap Rhys of Deheubarth, inflicts a crushing defeat on the Normans at the Battle of Crug Mawr and annexes Ceredigion$^{:111}$ |
| 1137 | 11 April | Death of Gruffudd ap Cynan; he is succeeded as king of Gwynedd by his son Owain ap Gruffudd (who later becomes known as Owain Gwynedd)$^{:113}$ |
| 1157 | July | Owain Gwynedd, with an army of around 3,000, forces the retreat of Henry II's much larger army (supported by Madog of Powys, who has yielded to Henry the previous year) at the Battle of Ewloe in Flintshire; following the campaign, Owain yields to Henry, but retains his rule and territory |
| 1160 | | Following the death of Madog ap Maredudd, the kingdom of Powys is split into two parts: Maelor, the northern portion, is later renamed Powys Fadog; and Cyfeiliog, in the south, becomes Powys Wenwynwyn |
| 1165 | August | Henry II's efforts to subdue north Wales continue with the inconclusive Battle of Crogen in the Ceiriog Valley |
| 1170 | | Death of Owain Gwynedd throws the kingdom of Gwynedd into disarray; within weeks, his nominated heir Hywel is dead, and his illegitimate son Dafydd usurps the rule of Gwynedd, but he fails to maintain his father's hold on south Wales, which falls into the hands of Rhys ap Gruffydd$^{:133}$ |
| 1171 | | Henry II leads a large army into south Wales, meets amicably with Rhys ap Gruffydd, and after making an offering at St David's shrine, he sails from Pembroke with his army for Ireland |
| 1172 | | Rhys ap Gruffydd is appointed justice of south Wales by Henry II, essentially becoming ruler in Henry's stead |
| 1176 | December | To celebrate his primacy, Rhys ap Gruffydd hosts a gathering of bards, musicians and performers at Cardigan Castle, which is now regarded as the first recorded eisteddfod |
| 1188 | | Gerald of Wales accompanies the Archbishop of Canterbury on a journey through Wales to recruit volunteers for the Third Crusade; Owain Cyfeiliog, Prince of Powys Wenwynwyn refuses to support the visit and is consequently excommunicated |
| 1191 | | Gerald of Wales writes Itinerarium Cambriae, an account of his tour of Wales with the Archbishop of Canterbury three years earlier |
| 1194 | | Llywelyn ap Iorwerth (who later becomes known as Llywelyn the Great) defeats his uncle Dafydd ab Owain Gwynedd at the Battle of Aberconwy and seizes control of Gwynedd |
| 1194 | | Gerald of Wales writes Descriptio Cambriae; he writes of Wales as a nation, with defined borders, and a common ancestry and identity who "if they would be inseparable, they would be insuperable" |

## 13th century

| Year | Date | Event |
| 1200 | | By this date, the title of regional rulers as "king" has given way to the title "prince" |
| 1201 | July | Llywelyn the Great, Prince of Gwynedd, signs a treaty with King John of England and they remain on good terms for the next ten years |
| 1204 | | After five years of lobbying, including directly to the Pope, Gerald of Wales fails to have St David's raised to an archbishopric |
| 1205 | | Llywelyn the Great consolidates his position by marrying King John's illegitimate daughter Joan |
| 1211 | August | Suspicious of Llywelyn's expansion of Gwynedd into neighbouring territories, King John invades Gwynedd, assisted by most of the other Welsh princes, forcing Llywelyn to seek terms with John and accept abandonment by his allies |
| 1212 | | John's clear intent of intrusive overlordship of Wales leads to Welsh leaders rallying to Llywelyn the Great, who recaptures all of Gwynedd; King John plans another invasion but this attempt is abandoned |
| 1215 | May | Llywelyn, in support of the disaffected English barons, seizes Shrewsbury, a factor in King John's submission to the barons |
| 1215 | 15 June | When King John is forced to sign Magna Carta, Llywelyn the Great is rewarded with several favourable provisions relating to Wales, in particular the rights to its own laws |
| 1218 | | After three more years of conflict within Wales, Llywelyn overcomes all opposition and receives the homage of all the other Welsh rulers, and his pre-eminence is confirmed by the English crown in the Treaty of Worcester |
| 1234 | 21 June | The "Peace of Middle" establishes a truce between Llywelyn the Great and the English Crown; Llywelyn styles himself "Prince of Aberffraw" and "Lord of Snowdonia" |
| 1240 | 11 April | Death of Llywelyn the Great; Dafydd ap Llywelyn succeeds his father as Prince of Gwynedd, but King Henry III does not support his overlordship as prince of all Wales, thus deliberately undermining Welsh unity |
| 1244 | | King Henry III of England attacks Gwynedd; Dafydd styles himself prince of Wales; he offers Wales as a vassal state to the Pope, to free Wales from English dominion, but this is denied |
| 1246 | 25 February | Dafydd ap Llywelyn dies without issue; his nephew Llywelyn ap Gruffudd (grandson of Llywelyn the Great) eventually succeeds as Prince of Gwynedd |
| 1247 | | After three years of devastating war, Wales is reduced again to lordships under English rule by the Treaty of Woodstock |
| 1258 | | Llywelyn ap Gruffudd begins to use the title of "Prince of Wales" |
| 1267 | 29 September | King Henry III accepts Llywelyn ap Gruffudd as Prince of Wales under the terms of the Treaty of Montgomery |
| 1282 | 11 December | Death of Llywelyn ap Gruffudd at the Battle of Orewin Bridge; his brother Dafydd ap Gruffydd succeeds, styling himself Prince of Wales |
| 1283 | 22 June | Dafydd ap Gruffudd is captured by King Edward I of England and charged with high treason |
| 1283 | 3 October | Dafydd ap Gruffudd is executed at Shrewsbury |
| 1284 | 3 March | King Edward I enacts the Statute of Rhuddlan, which provides the constitutional basis for the government of the Principality of North Wales |
| 1294–1295 | | Madog ap Llywelyn leads a Welsh revolt against English rule, claiming the title of "Prince of Wales" |
| 1295 | | Madog is defeated at the Battle of Maes Moydog; he escapes, but subsequently surrenders unconditionally and is taken to London, but his fate is unknown. |

## 14th century

| Year | Date | Event |
| 1301 | 7 February | Edward of Carnarvon is invested as the first English Prince of Wales (as the title is transferred to the heir apparent to the English or British throne) |
| 1306 | | Work resumes on Beaumaris Castle prompted by fears of a Scottish invasion of North Wales |
| 1316 | 28 January | Llywelyn Bren launches a surprise attack on Caerphilly Castle in a revolt against English rule in Wales; he lays siege to the castle for six weeks and surrenders unconditionally to King Edward II's forces on 18 March |
| 1318 | | Llywelyn Bren is unlawfully executed at Cardiff Castle |
| 1321 | May | Newport, Cardiff and Caerphilly are seized by the Marcher Lord Roger Mortimer in an intense eight-day campaign in the Despenser War against King Edward II of England |
| 1326 | | King Edward II retreats to Wales with his forces after his regime collapses; he is captured by rebel forces north of Caerphilly, escorted back to England via Monmouth Castle and relinquishes his crown two months later |
| 1330 | | The construction of Beaumaris Castle is halted and, despite a huge sum of money being spent on it (£15,000) the building is never completed |
| 1339 | | Farndon Bridge is built across the River Dee and the Wales–England border |
| 1345 | | The first stone bridge at Llangollen is built across the River Dee by John Trevor |
| 1369 | | Owain Lawgoch launches an unsuccessful invasion attempt on Wales in a bid to take back his confiscated lands |
| 1372 | May | In Paris, Owain Lawgoch announces his intention of claiming the throne of Wales, and then mobilises his forces in readiness for another invasion attempt |
| 1384 | | Owain Glyndŵr enters the army of King Richard II of England |
| 1399 | July–September | King Richard II seeks refuge at Conwy Castle and surrenders to Henry Bolingbroke at Flint Castle |

## 15th century

| Year | Date | Event |
| 1401 | March | Conwy Castle is taken by Owain Glyndŵr's supporters and is held for several months. |
| 1401 | June | Battle of Mynydd Hyddgen, part of the Glyndŵr Rising against English rule, is the first major victory for Glyndŵr's Welsh rebels. |
| 1401 | 2 November | At the Battle of Tuthill at Caernarfon, Owain Glyndŵr first raises the royal standard bearing a golden dragon on a white field. |
| 1402 | 22 June | Battle of Bryn Glas (also known as the Battle of Pilleth) ends in victory for Owain Glyndŵr, prolonging the Welsh rebellion against English rule.$^{:22,231}$ |
| 1402 | August | Owain Glyndŵr receives a warm welcome in southeast Wales. |
| 1403 | July | Owain Glyndŵr attacks, but fails to take, Carreg Cennen Castle. |
| 1403 | 21 July | Battle of Shrewsbury ends in defeat and death of Henry Percy, an ally of Owain Glyndŵr, ending the Percy challenge to King Henry IV of England. |
| 1403 | Autumn | The reputed Battle of Stalling Down near Cowbridge ends in defeat for the King's army. |
| 1404 | May | Owain Glyndŵr writes to the King of France requesting military support. |
| 1404 | July | Owain Glyndŵr holds a Welsh Parliament in Machynlleth, where he is crowned Prince of Wales in the presence of envoys from France, Scotland and Castile. |
| 1405 | 28 February | Peak of the Glyndŵr Rising: Tripartite Indenture is agreed between Owain Glyndŵr, Henry Percy and Edmund Mortimer, to divide Wales and England between them, at the expense of King Henry IV. |
| 1405 | 5 May | Battle of Pwll Melyn is the first major defeat for Owain Glyndŵr. |
| 1405 | August | French forces land at Milford Haven; Owain Glyndŵr holds his second Welsh Parliament, at Harlech Castle. |
| 1405 | November | Owain Glyndŵr's forces and French forces reach Worcester, but not seeing English support, the French abandon the campaign and return to France. |
| 1406 | 31 March | Owain Glyndŵr writes the "Pennal Letter" to King Charles VI of France, outlining his vision for the future government of an independent Wales. |
| 1408 | September | Aberystwyth Castle surrenders to the English, and Owain Glyndŵr moves his court to Harlech. |
| 1409 | | Harlech Castle is captured by English forces; Glyndŵr and his supporters flee to the mountains, from where they continue sporadic attacks for several years; Glyndŵr's wife Margaret Hanmer is taken prisoner, along with her children and grandchildren, most of whom probably die later in captivity (Hanmer herself dies c. 1420). |
| 1413 | | Nothing is heard of Owain Glyndŵr after this date. |
| 1415 | 21 September | End of the Glyndŵr Rising; approximate date of Owain Glyndŵr's death, possibly in Herefordshire |
| 1415 | 25 October | Welsh archers play a key part in the victory of King Henry V of England over a much larger French army at the Battle of Agincourt; some Welsh combatants fight on the French side. |
| 1417 | 30 April | Owain Glyndŵr's son, Maredudd ab Owain Glyndŵr, declines the offer of a pardon from King Henry V for both himself and his father. |
| 1421 | | Maredudd ab Owain Glyndŵr finally accepts a pardon (for himself alone) from King Henry V. |
| 1437 | | Work begins on the construction of the (present) Raglan Castle, replacing an earlier structure. |
| c. 1451 | | The first large-scale eisteddfod is held at Carmarthen: Dafydd ab Edmwnd wins the silver chair for his poetry. |
| 1460 | 10 July | Following defeat at the Battle of Northampton, the Queen of England, Margaret of Anjou, escapes to Harlech Castle with her son Edward, Prince of Wales. |
| 1468 | 14 August | The garrison of Harlech Castle surrenders to King Edward IV after a seven-year siege. |
| 1471 | 4 May | The Battle of Tewkesbury ends Lancastrian hopes of regaining the ascendance over the House of York in the Wars of the Roses; King Edward IV is victorious, and Edward of Westminster becomes the only Prince of Wales ever to die in battle. |
| 1473 | | The Court of the President and Council of Wales is established at Ludlow Castle. |
| 1483 | 14 April | Whilst residing at Ludlow Castle, 12-year-old King Edward V of England receives news of his father's sudden death and his own accession to the English throne; the Council at Ludlow comes to an end. |
| 1485 | 1 August | Henry Tudor lands near Dale, Pembrokeshire, and marches through Wales (8 to 14 August) and England where, on 22 August, he defeats King Richard III at the Battle of Bosworth Field to become the third and last Welsh-born King of England. |
| 1488 | | King Henry VII's uncle, Jasper Tudor, takes possession of Cardiff Castle. |
| 1490 | 27 February | English-born Arthur Tudor, the eldest son of King Henry VII, is ceremonially invested as Prince of Wales at the Palace of Westminster. |
| 1498 | | An insurrection breaks out in Meirionydd in north Wales and the rebels capture Harlech Castle; the revolt is the last of the medieval era in Wales. |

## 16th century

| Year | Event |
| 1523 | Caerwys hosts an eisteddfod, one of the most important of the early modern era, attended by Welsh poet Tudur Aled |
| 1535–1542 | Laws in Wales Acts replace Welsh law with English law and replace the Marcher Lordships with newly established counties; Wales is unified with England |
| 1536 | Dissolution of the monasteries: a great number of abbeys and priories in Wales are suppressed over the next four years, including Monmouth Priory, Neath Abbey, and Tintern Abbey |
| 1546 | Yny lhyvyr hwnn, the first book to be printed in the Welsh language (said to be written anonymously by Sir John Prise), is published in London |
| 1563 | The Usk Bridge is built to replace the medieval bridge that was washed away in floods in 1535; this is Brecon's oldest route over the River Usk |
| 1567 | Caerwys hosts its second large-scale eisteddfod, sanctioned by Queen Elizabeth I of England |
| 1573 | The earliest map showing Wales as a separate country from the rest of Great Britain, Cambriae Typus by Humphrey Llwyd, is published in the first modern atlas Theatrum Orbis Terrarum |
| 1584 | The first Welsh copper smelting works is established at Aberdulais |
| 1588 | The first translation of the Bible into Welsh, Y Beibl cyssegr-lan by bishop William Morgan, is published |

## 17th century

| Year | Date | Event |
| 1601 | | Poor Relief Act 1601 is passed to create a poor law system in England and Wales |
| 1606 | 12 April | A new national flag is created by royal decree to mark the union between England and Scotland; Wales is not represented in the design because it is legally a part of England |
| 1607 | 30 January | Bristol Channel floods cause devastation on the south coast of Wales, affecting Pembrokeshire, Glamorgan, and Monmouthshire; Cardiff is the worst affected town, with the foundations of St Mary's Church destroyed |
| 1615–1617 | | The Wye Bridge in Monmouth is rebuilt in stone |
| 1620 | | Bishop William Morgan's Bible translation into Welsh (first published in 1588) is revised by Bishop Richard Parry and Dr John Davies as Y Bibl Cyssegr-lan, and published in London |
| 1636 | | The three-arch stone bridge, Pont Fawr, at Llanrwst is built by Sir John Wynn of Gwydir Castle; nicknamed locally as "Pont Inigo Jones", its design is attributed to classical architect Inigo Jones |
| 1640 | | Cannon production begins at Bersham Ironworks |
| 1642/43 | | Skirmishes between Parliamentarians and Royalists bring the English Civil War to (largely Royalist or neutral) Wales, including naval action at Milford Haven |
| 1643 | November | Parliamentary forces make piecemeal strategic gains in Wales from the north and south |
| 1644 | April | Further advances by Parliamentary forces in southwest Wales, threatening Cardiganshire and Carmarthenshire |
| 1644 | July | Widespread military actions across the whole of south Wales, resulting in gains for the Parliamentarians |
| 1644 | 17 September | The first battle of the English Civil War on Welsh soil takes place at Montgomery and the castle is taken by the Parliamentarians |
| 1644/45 | | Cardigan Castle is besieged and captured by Parliamentarians, before being attacked by Royalists who leave the castle slighted and burned |
| 1645 | June–September | King Charles I of England tours south and mid-Wales to rally support in the wake of his defeat at the Battle of Naseby |
| 1646 | February | Cardiff Castle is besieged by Royalists, but relieved by Parliamentarians |
| 1646 | April–June | Aberystwyth Castle, after a long siege, surrenders to Parliamentary forces; most castles in north Wales are under siege; Caernarvon, Anglesey and Beaumaris submit to Parliament |
| 1646 | 19 August | Raglan Castle surrenders to Parliamentary forces |
| 1646 | October | Denbigh Castle surrenders to Parliamentary forces |
| 1647 | 19 January | Holt Castle surrenders to Parliamentary forces after a siege lasting several months |
| 1647 | 16 March | Harlech Castle surrenders to Parliamentary forces; it is the last Royalist stronghold of the English Civil War in mainland Britain |
| 1648 | 8 May | The Battle of St. Fagans takes place near Cardiff, a pitched battle (termed by some an insurrection) between Parliamentarians and Royalists (more accurately disaffected Parliamentary forces), part of the Second English Civil War, in which there is fighting throughout south Wales |
| 1648 | June | Fighting breaks out in north Wales; the insurrection is suppressed |
| 1648 | July | After a long siege, Pembroke surrenders to Parliament |
| 1648 | July–October | Anglesey is the last area in Wales to submit to the rule of Parliament, which demands the sum of £7,000 for military expenditure; end of the English Civil War in Wales |
| 1649 | January | Welsh politicians, Thomas Wogan (Pembroke) and John Jones Maesygarnedd (Merioneth), are among the signatories to the death warrant of Charles I; after the restoration, Wogan flees the country and Jones is executed |
| 1649 | | Aberystwyth Castle is slighted by Commonwealth troops |
| 1649 | June | Montgomery Castle is demolished by order of the Rump Parliament |
| 1650 | 22 February | The Act for the better propagation and preaching of the Gospel in Wales is passed by Parliament, resulting in the ejection of dissident clergymen and the creation of English-language schools |
| 1655 | | Conwy Castle is slighted by order of the English Council of State following the British Civil Wars |
| 1659 | 5 August | Booth's Rebellion proclaims Charles II as King of England; its leaders include Thomas Myddelton, a former Parliamentary general, of Chirk Castle near Wrexham |
| 1659 | | Denbigh Castle is slighted after being seized by Royalist soldiers |
| 1682 | 30 August | A group of Welsh settlers, including Thomas Wynne, set sail for Pennsylvania |
| 1686 | | Welsh Quaker leader Rowland Ellis, and his fellow Quakers, leave Wales for Pennsylvania to avoid religious persecution |
| 1688 | | Abergavenny's Royal charter is annulled when the chief officers of the town's corporation refuse to take the oath of allegiance to King William III of England, leading to a subsequent decline in the town's prosperity |
| 1694 | | The first of two copper mills opens in the Neath Valley, powered by waterfalls on the River Neath. Copper smelting, refining and working becomes a prime commercial concern in Wales in the late 17th century. |

## 18th century

| Year | Date | Event |
| 1717 | 4 November | Skerries Lighthouse begins operation, guiding ships past the low tract of submerged land off Carmel Head, northwest Anglesey |
| 1723 | | The Workhouse Test Act (also known as Knatchbull's Act) is passed by UK government, leading to the establishment of numerous workhouses in England and Wales over the next two decades |
| 1746 | | The Wales and Berwick Act is passed, creating a statutory definition of "England" as including England, Wales and Berwick-upon-Tweed |
| 1761 | | Bersham Ironworks employs a new boring machine for the accurate production of smooth bore cannon, later supplying cannon for use in the American War of Independence and the Napoleonic wars |
| 1765 | | Opening of the Cyfarthfa Ironworks and construction of the first coke blast furnace for the production of pig iron |
| 1768 | | A rich seam of copper ore is discovered at Parys Mountain, Anglesey, leading to the formation of the Parys Mine Company, soon to become the world's most productive copper mining concern. Wales dominates the world copper markets throughout this period. |
| 1782 | | The Relief of the Poor Act (also known as Gilbert's Act) is passed by UK government, enabling poor relief to be provided at home for the able-bodied poor (later repealed in 1871 by the Statute Law Revision Act) |
| 1793 | | Pont-y-Cafnau, the world's earliest surviving iron railway bridge, is constructed to support a tramway and aqueduct for the transport of raw materials to the Cyfarthfa Ironworks |
| 1797 | 22–24 February | The Pembrokeshire coast is invaded by Republican France in the Battle of Fishguard, often referred to as the "last invasion of Britain" as it represents the last assault launched on British soil by a hostile foreign power |

## 19th century

| Year | Date | Event |
| 1802 | | Admiral Nelson pays a personal visit to the Cyfarthfa Ironworks in Merthyr Tydfil |
| 1804 | 21 February | The world's first ever railway journey takes place when Richard Trevithick's steam locomotive runs along the newly laid tramroad from Penydarren Ironworks to the canal wharf at Abercynon |
| 1810/11 | | William Madocks builds a sea wall to reclaim a large proportion of Traeth Mawr from the sea for agricultural use, the origins of the town of Porthmadog |
| 1819 | | The first "provincial" eisteddfod is held in Carmarthen, marking the revival of the traditional arts festival as a Welsh institution |
| 1823 | 18 January | The Red Lady of Paviland, a partial skeleton from the Stone Age, is discovered by William Buckland in a limestone cave on the Gower Peninsula; considered to be the oldest known ceremonial burial in Western Europe |
| 1830 | | Merthyr Tydfil is by now the largest town in Wales, mainly populated by workers in the iron and coal industries, and their families |
| 1831 | June | An armed uprising takes place in Merthyr Tydfil, as thousands of workers protest against their poor wages and working conditions |
| 1831 | 13 August | Despite a petition for his release, a young miner called Richard Lewis (also known as Dic Penderyn) is hanged outside Cardiff Gaol for stabbing a soldier with a bayonet during the Merthyr Rising; later proven to be innocent, he is remembered as a working-class martyr |
| 1833 | | Samuel Lewis publishes the comprehensive, two-volume, historical and geographical A Topographical Dictionary of Wales (the 4th edition, 1849, is online) |
| 1834 | 14 August | Poor Law Amendment Act is passed by UK government, replacing earlier poor relief legislation and fundamentally reforming the poverty relief system in England and Wales (later repealed in 1948 at the rise of the British welfare state) |
| 1835 | | The Swansea Philosophical & Literary Society is established with the purpose of making Swansea a centre of culture and scientific research |
| 1837 | | Opening of Port Talbot Docks, the first major docks in South Wales, which are named after Christopher Rice Mansel Talbot (MP for Glamorganshire), the main sponsor of the project |
| 1838 | | The Swansea Philosophical & Literary Society is granted a royal charter in recognition of the high quality of scientific research by its members; the society is renamed the Royal Institution of South Wales |
| 1839 | 4 November | Newport Rising, an armed rebellion by the Chartism movement against authority, led by Chartist John Frost |
| 1840 | 16 January | Chartists John Frost, Zephaniah Williams and William Jones are found guilty of high treason for their part in the 1839 Newport Rising, and sentenced to death (later commuted to penal transportation) |
| 1840 | 5 June | Joseph Brown is appointed Vicar Apostolic of the Roman Catholic District of Wales |
| 1840 | 8 October | Official opening of Taff Vale Railway, the first steam-worked passenger railway in Wales |
| 1840 | 28 October | Joseph Brown, Vicar Apostolic of the Roman Catholic District of Wales, is consecrated as a bishop |
| 1841 | 19 February | The Governor Fenner, carrying emigrants to America, collides with a steamer off Holyhead and sinks with the loss of 123 lives |
| 1841 | 9 March | The earliest recorded photograph in Wales, a daguerreotype of Margam Castle, is taken by Calvert Jones |
| 1841 | April | The population of Wales exceeds one million |
| 1841 | 21 April | The Taff Vale Railway is extended from Abercynon to Merthyr Tydfil |
| 1841 | | Opening of Swansea Museum—the oldest museum in Wales—by the Royal Institution of South Wales |
| 1842 | 12 April | Morgan Williams travels to the Chartist Convention in London, to present to parliament a petition signed by 36,000 people from south Wales |
| 1842 | May | The Royal Children's Employment Commission publishes its first report on the employment of children in the British coal industry, which reveals that children as young as five are working long shifts underground |
| 1842 | June | The Rebecca Riots begin in earnest in south and west Wales, as local farmers and agricultural workers launch a series of attacks on tollhouses and other symbols of economic oppression |
| 1842 | 10 October | Official opening of the Town Dock (later known as the "Old Dock"), the first floating dock facility in Newport harbour, able to accommodate the largest ships in the world |
| 1850 | | National Roman Legion Museum is established in Caerleon, near Newport |
| 1851 | | A bronze statue of the British military leader Sir William Nott is erected in his home town of Carmarthen |
| 1860 | 1 December | A major explosion at the Black Vein Colliery in Risca, southeast Wales, claims 142 lives |
| 1861 | | The first official National Eisteddfod as we know it today took place in Aberdare |
| 1865 | 28 July | 153 Welsh settlers establish Y Wladfa in Patagonia, Argentina |
| 1867 | 8 November | Two explosions at the Ferndale Colliery in the Rhondda Valley claim the lives of 178 men and boys |
| 1875 | 16 April | Official opening of the Alexandra Dock in Newport, following the success of the Town Dock and the subsequent increase in the volume of trade |
| 1875 | | Cyfarthfa Ironworks is forced to close after more than 100 years of production |
| 1878 | 11 September | A catastrophic explosion at the Prince of Wales Colliery in Abercarn claims the lives of 268 men and boys |
| 1880 | 15 July | A major explosion at the New Risca Colliery in Risca, southeast Wales, claims 120 lives |
| 1883 | | Cardiff hosts the National Eisteddfod for the first time since its modern inception in 1861 |
| 1887 | | The National Eisteddfod is held in London's Royal Albert Hall for the first time |
| 1888 | | The small village of Llanwddyn, at the head of the Vyrnwy valley, is flooded to create the Lake Vyrnwy reservoir for supplying fresh water to Liverpool and Merseyside |
| 1890 | 6 February | An explosion at the Llanerch Colliery in Abersychan claims the lives of 176 men and boys |
| 1890 | 10 April | David Lloyd George returned as Liberal MP for Carnarvon Boroughs |
| 1893 | 6 June | The second of the Alexandra Docks, the South Dock, opens at Newport (and the original Alexandra Dock is renamed the "North Dock") |
| 1893 | | Construction work begins on the dams for the Elan Valley Reservoirs, which will supply clean drinking water to Birmingham in the English West Midlands |
| 1894 | 23 June | An explosion at the Albion Colliery in Cilfynydd claims the lives of 290 men and boys; one of the worst mining accidents ever to occur in the United Kingdom, it is the second worst mining disaster in Welsh history (after the Senghenydd colliery disaster in 1913) |

## 20th century

| Year | Date | Event |
| 1900–1920 | | Peak of the coal mining industry in Wales, with more than 600 collieries employing over 230,000 men |
| 1901 | | The population of Wales exceeds two million, having doubled in 60 years |
| 1904 | 21 July | Official opening of the Elan Valley Reservoirs by King Edward VII of England and Queen Alexandra; water starts flowing along 118 km of gravity-driven pipeline to the Frankley Reservoir in Birmingham |
| 1905 | | Construction of the original steel mill at Port Talbot is completed |
| 1905 | 28 October | Cardiff is granted city status by King Edward VII |
| 1906 | 27 June | An earthquake strikes near Swansea, causing some minor structural damage to buildings; measuring 5.2 on the Richter scale, it is one of the most significant earthquakes to occur in the UK in the 20th century |
| 1907 | 19 March | National Museum of Wales and the National Library of Wales is established in Cardiff and Aberystwyth respectively, by a royal charter |
| 1908 | 10 August | Royal Commission on the Ancient and Historical Monuments of Wales established |
| 1911 | 13 July | Prince Edward is invested as the Prince of Wales in an elaborate ceremony at Caernarfon Castle |
| 1911 | 16 December | The 1911 Coal Mines Act is passed, following a series of mine disasters in the 19th and early-20th centuries, including several in Wales; the Act amends existing laws covering safety and other aspects of the UK coal mining industry |
| 1911–1913 | | A significant prehistoric metalwork hoard, thought to have been deposited in a sacred ritual, is discovered at Llyn Fawr when the lake is partially drained for the construction of a new reservoir |
| 1913 | 14 October | A huge explosion at the Universal Colliery in Senghenydd claims the lives of 439 men and boys; it is the worst mining disaster in the history of the British coalfields |
| 1914 | 18 September | The long-awaited Welsh Church Act receives royal assent, but will not come into force until after World War I |
| 1916 | 6 December | David Lloyd George becomes Prime Minister of the United Kingdom; although not actually Welsh-born, Lloyd George grew up in Wales and he was the first Welsh-speaking British prime minister |
| 1919 | | Final closure of the Cyfarthfa Ironworks, which is dismantled nine years later |
| 1920 | 31 March | The Welsh Church Act 1914 takes effect, allowing the creation of the Church in Wales which encompasses most of the Welsh part of the Church of England; The Act disestablishes the Church in Wales and establishes the Archbishopric of Wales; the first Archbishop is Alfred George Edwards |
| 1924 | 25 September | Malcolm Campbell sets a world land speed record of 146.16 mph (235.22 km/h) on Pendine Sands, Carmarthen Bay, in his Sunbeam 350HP car Blue Bird, the first of several successful record attempts on the Sands in the 1920s |
| 1925 | 5 August | The Welsh social-democratic political party Plaid Genedlaethol Cymru (meaning "The National Party of Wales") is formed in Pwllheli, later changing its name to Plaid Cymru (or simply "The Party of Wales") |
| 1929 | May | The first Urdd National Eisteddfod, a competitive youth festival of literature, music and performing arts, is held in Corwen, Denbighshire |
| 1930 | October | Closure of Newport's "Old Dock", as resources are concentrated on the modern Alexandra Dock complex |
| 1934 | 22 September | A major explosion at the Gresford Colliery near Wrexham claims the lives of 266 men |
| 1935 | | Production of Y Chwarelwr (The Quarryman), the first audio feature film recorded in the Welsh language |
| 1936 | 8 September | Arson attack at RAF Penrhos "bombing school" by three members of Plaid Genedlaethol Cymru, known as the Tân yn Llŷn (Fire in Llŷn) protest; the culmination of an ongoing opposition campaign, it is considered to be a defining moment in the history of the political party |
| 1936/7 | | Welsh archaeologist W. F. Grimes excavates the tomb of Pentre Ifan in Pembrokeshire |
| 1942/3 | | Over 150 Iron Age metal objects are discovered in Llyn Cerrig Bach on Anglesey, evidently placed in the lake as votive offerings |
| 1947 | 1 January | The British coal industry is nationalised as a result of the Coal Industry Nationalisation Act 1946; the move is unable to halt the decline in the Welsh coal mining industry and the repeated closure of Welsh collieries |
| 1947 | June | The first International Musical Eisteddfod is held in Llangollen |
| 1948 | 1 July | A national open-air museum (originally called the "Welsh Folk Museum") opens to the public at St Fagans Castle near Cardiff, the Earl of Plymouth having donated the site to the National Museum of Wales in 1946 |
| 1948 | 5 July | The National Health Service is established in the UK as one of a series of welfare reforms designed to guarantee basic levels of personal and social security after the Second World War |
| 1951 | 17 July | Official opening of the Abbey Steelworks in Port Talbot; the new steel production plant is fully operational within two years |
| 1951 | 18 October | Snowdonia National Park is designated as the first national park in Wales; it has a total area of 823 square miles (2,130 km$^2$) and incorporates Snowdon, the highest mountain in Wales |
| 1952 | 29 February | Pembrokeshire Coast National Park is designated as the second national park in Wales; noted for its spectacular coastline, the park covers a total area of 236 square miles (612 km$^2$) |
| 1952 | 15 August | Television becomes available in Wales for the first time following the switching on of the Wenvoe transmitting station. |
| 1952 | 23 October | Completion of Elan Valley Reservoirs project, with the official opening of the Claerwen dam by Queen Elizabeth II |
| 1953 | | Further restoration work is carried out at Conwy Castle on lease to the UK's Ministry of Works |
| 1955 | 20 December | Cardiff is named the capital city of Wales |
| 1957 | 17 April | Brecon Beacons National Park is designated as the third of three national park in Wales; incorporating Pen y Fan, the highest peak in south Wales, the park covers a total area of 520 square miles (1,347 km$^2$) |
| 1958 | 14 January | Independent television comes to Wales when TWW starts broadcasting across South Wales. Four years later, Wales West and North Television begins broadcasting to the northern areas of Wales. |
| 1958 | 26 July | Prince Charles is named Prince of Wales at the closing ceremony of the British Empire and Commonwealth Games in Cardiff (his investiture is delayed until July 1969) |
| 1960–1970 | | Peak production at the Abbey Steelworks in Port Talbot: by the mid-1960s, the site has grown to be Europe's largest steel-producing complex and the largest single employer in Wales, with a workforce of over 18,000 |
| 1961 | | Closure of the original steel mill at Port Talbot; the site is demolished a few years later |
| 1961 | 17 August | The Lower Swansea Valley Project is launched, with the aim of reclaiming the land that has been devastated by industrial processes over the past two centuries; the land will eventually house new developments such as the Maritime Quarter, a shopping complex, sports complex and industrial park |
| 1962 | 4 August | The Welsh Language Society (Cymdeithas yr Iaith Gymraeg) is established, to campaign for the right of Welsh people to use the Welsh language in every aspect of their lives |
| 1964 | 17 October | The post of Secretary of State for Wales is created in the UK government when Harold Wilson appoints the MP for Llanelli, Jim Griffiths, to the new role |
| 1965 | 21 October | Official opening of the Llyn Celyn reservoir, created by flooding parts of the Afon Tryweryn valley, including the village of Capel Celyn, for supplying water to Liverpool and parts of the Wirral Peninsula |
| 1966 | 14 July | Plaid Cymru gains its first seat in the UK Parliament, as Gwynfor Evans wins the Carmarthen bi-election |
| 1966 | 21 October | The Aberfan disaster kills 116 children and 28 adults |
| 1967 | 27 July | Parts of the Wales and Berwick Act 1746 that relate to the "dominion of Wales" are repealed by the Welsh Language Act 1967, allowing free use of the Welsh language in some political and legal proceedings |
| 1969 | 1 July | Prince Charles is invested as the Prince of Wales at Caernarfon Castle; the televised event attracts a world-wide audience of 500 million people, the largest TV audience ever gained for an event in Wales |
| 1970 | | Opening of Pembrokeshire Coast Path, a designated National Trail in Pembrokeshire, southwest Wales; mostly a cliff-top walking route, the path measures a total distance of 186 miles (299 km) |
| 1971 | 10 July | Official opening of Offa's Dyke Path, a designated National Trail stretching for 177 miles (285 km) along the Wales–England border from the Severn Estuary to the Irish Sea coast, with a visitors' centre at the "half-way point" in Knighton, Powys |
| 1972 | 25 May | The National Slate Museum opens to the public in Llanberis, Gwynedd |
| 1974 | 1 April | Enactment of the Local Government Act 1972 replaces civil parishes with communities |
| 1976 | | Opening of the South Wales Miners' Museum in the Afan Forest Park, the first mining museum in Wales |
| 1976 | | The National Wool Museum is established at Dre-fach Felindre in Carmarthenshire |
| 1977 | 3 January | BBC Radio Cymru launches and becomes the first broadcasting outlet dedicated wholly to programmes in Welsh. The service is part-time, and it is not until the end of the decade that the station is on air for a significant number of hours each day. |
| 1978 | 23 November | BBC Radio Wales launches on the former Radio 4 Welsh medium wave opt-out wavelength, initially with very limited broadcast hours; establishing a separate network is made possible by the transfer of Radio 4 to a fully UK-wide network on moving from medium wave to long wave. |
| 1979 | 1 March | In the first Welsh devolution referendum, the electorate votes against establishing a devolved assembly |
| 1982 | 1 November | S4C begins broadcasting as Wales' fourth television channel. The channel broadcasts Welsh programming during peaktime and airs programmes from Channel 4, which launches the nest day, during off-peak hours. |
| 1983 | | The Big Pit National Coal Museum opens to the public in Blaenafon, southeast Wales |
| 1984 | 19 July | An earthquake measuring 5.4 on the Richter scale strikes the Llŷn Peninsula in Gwynedd, the largest earthquake to occur in the UK since instrumental measurements began |
| 1986 | | The Castles and Town Walls of King Edward in Gwynedd is added to the UNESCO World Heritage List, making it the first World Heritage Site in Wales. |
| 1987 | 3 April | Cardiff Bay Development Corporation is set up by the UK government to redevelop an area of Cardiff to produce Cardiff Bay |
| 1987 | September | Skerries Lighthouse becomes fully automated |
| 1989 | | Bodelwyddan Castle's portrait gallery exhibition is named National Heritage Museum of the Year |
| 1993 | 21 October | Welsh Language Act 1993 (c. 38) (Welsh: Deddf Yr Iaith Gymraeg 1993) is an Act of the Parliament of the United Kingdom, which put the Welsh language on an equal footing with the English language in Wales |
| 1996 | | Swansea City Council saves Swansea Museum from the threat of closure |
| 1997 | 18 September | The second Welsh devolution referendum results in a small majority in favour of forming a devolved assembly for Wales |
| 1998 | 31 July | The Government of Wales Act receives royal assent and becomes law, allowing a National Assembly for Wales to be established following elections to be held in May 1999 |
| 1999 | 6 May | In the first National Assembly for Wales election, Welsh Labour wins the most seats but falls short of an overall majority, resulting in a minority Labour administration |
| 1999 | 27 May | Queen Elizabeth II and Charles, Prince of Wales, officially open the Welsh National Assembly at Crickhowell House in Cardiff Bay, a symbolic transfer of legislative powers from Westminster to Wales |
| 1999 | 26 June | The Millennium Stadium, the Welsh national stadium in Cardiff, opens in time to host the 1999 Rugby World Cup |

## 21st century

| Year | Date | Event |
| 2000 | June | Don Wales (grandson of Sir Malcolm Campbell) sets a UK electric land speed record of 137 mph (220 km/h) on Pendine Sands in Bluebird Electric 2. |
| 2000 | 30 June | Cardiff Bay Development Corporation is dissolved, after the completion of a major regeneration project at Cardiff Bay. |
| 2000 | 21 July | Charles, Prince of Wales officially opens the National Botanic Garden of Wales, which has been open to the public since 24 May. |
| 2000 | 14 September | Penderyn whisky begins production at its distillery in the Brecon Beacons National Park; this is the first commercially available malt whisky made in Wales since the 19th century. |
| 2000 | 5 October | After operating as a minority government for seventeen months, the Welsh Labour Party agrees to form a coalition government with the Welsh Liberal Democrats in the Welsh Assembly; the coalition agreement is officially signed twelve days later. |
| 2000 | 2 December | Blaenavon Industrial Landscape in southeast Wales is added to the UNESCO World Heritage List, making it the second World Heritage Site in Wales. |
| 2000 | | Glyndwr's Way, a long-distance footpath in mid Wales, is granted National Trail status; the footpath runs for 135 miles (217 km) in an extended loop through Powys between Knighton and Welshpool. |
| 2001 | 1 June | Official opening of Cardiff Bay Barrage, one of the largest civil engineering projects in Europe. |
| 2001 | July | Welsh communities pressure group Cymuned (meaning "Community") is launched at a meeting in Mynytho on the Llŷn Peninsula; the group aims to protect and foster the Welsh language and way of life. |
| 2001 | 16 September | Actress Siân Phillips unveils a memorial statue to Catrin Glyndŵr in London, to commemorate "Glyndwr Day". |
| 2002 | June | The Newport Medieval Ship is discovered on the west bank of the River Usk during construction of Newport's Riverfront Arts Centre. |
| 2002 | 5 August | Dr Rowan Williams, Archbishop of Wales, is honoured by admission to the Gorsedd of bards. |
| 2002 | July/August | Closure and demolition of Ebbw Vale Steelworks, resulting from the collapse of the international steel market. |
| 2002 | 16 October | The Banc Ty'nddôl sun-disc is recovered during archaeological excavations on a Bronze Age site at Cwmystwyth in central Wales. |
| 2002 | 2 December | Dr Rowan Williams is confirmed as the next Archbishop of Canterbury (to be enthroned in February). |
| 2003 | | The North Wales edition of the Daily Post separates from the Liverpool Daily Post to become a standalone title. (Liverpool edition has since ceased) |
| 2003 | 29 March | The Cob at Porthmadog is purchased by the Welsh Government and the road toll is discontinued after 192 years. |
| 2003 | 1 May | The second National Assembly for Wales election is held, resulting in a minority government by Welsh Labour who choose not to enter into another coalition agreement. |
| 2003 | 19 June | HRH Prince William of Wales visits Bangor and Anglesey, to mark his 21st birthday (on 21 June). |
| 2003 | 15 August | A memorial to Owain Lawgoch, descendant of Llywelyn the Great, is unveiled at Mortagne-sur-Gironde, France. |
| 2003 | November | A£1.1 million DTI grant is awarded to Energybuild, the private owner of the Aberpergwm Colliery in the Neath Valley, to upgrade facilities and allow new coal reserves to be accessed. |
| 2003 | 21 November | North Hoyle Offshore Wind Farm, Wales' first offshore wind farm, commences operation. |
| 2004 | 1 March | Penderyn whisky is officially launched in the presence of HRH Prince Charles; demand is so high that the whisky sells out almost immediately. |
| 2004 | 13 March | The market town of Cowbridge, one of the smallest and oldest walled towns in Wales, celebrates the 750th anniversary of its royal charter. |
| 2004 | 26 November | Official opening of the Wales Millennium Centre, a large arts centre in Cardiff Bay. |
| 2005 | 29 January | Cardiff's David Morgan store, the largest independent department store in Wales, closes after 125 years of trading. |
| 2005 | 26 May | Big Pit National Coal Museum wins the Gulbenkian Prize for Museum of the Year 2005. |
| 2005 | 13 July | Prince Charles opens a new building to house the Narrow Gauge Railway Museum at Tywyn Wharf railway station in Gwynedd. |
| 2005 | October | A Welsh language version of Scrabble is marketed for the first time. |
| 2005 | 17 October | The National Waterfront Museum opens to the public in Swansea's Maritime Quarter. |
| 2005 | 19 October | Liverpool City Council issues a formal apology for the flooding of the Afon Tryweryn valley to create the Llyn Celyn reservoir in 1965. |
| 2005 | 1 December | Outlying properties in the Nedd Fechan valley, near Ystradfellte in southern Powys, are connected to mains electricity, probably the last community in the whole of England and Wales to be wired. |
| 2006 | 1 March | The new National Assembly building opens in Cardiff Bay; designed by Richard Rogers and costing £67m, it is known as the Senedd (the Welsh word for "parliament"). |
| 2006 | 25 July | Government of Wales Act 2006 comes into effect, conferring additional law-making powers on the National Assembly for Wales. |
| 2007 | 1 April | Prescription charges are abolished by NHS Wales; the Welsh Government is the first devolved government of the UK to remove these charges. |
| 2007 | 3 May | The third National Assembly for Wales election is held, resulting in a relative majority for Welsh Labour, while Plaid Cymru make considerable gains. |
| 2007 | 27 June | Labour and Plaid Cymru announce their intention to form a coalition government, and enter into the One Wales agreement which includes holding a referendum on full law-making powers for the Welsh Assembly. |
| 2008 | 25 January | Official closure of Tower Colliery in the Cynon Valley, South Wales, the last remaining deep coal mine to be worked in the whole of Wales. |
| 2008 | 12 June | Cardiff Castle opens a new interpretation centre at a cost of £6 million. |
| 2008 | 12 September | Completion of the Meridian Tower in Swansea's Maritime Quarter; the Tower is the tallest building in Wales, standing at a height of 107 metres (351 feet). |
| 2008 | 20 November | AM and Heritage Minister Alun Ffred Jones becomes the first person to use the Welsh language as a representative of the UK government at a European Union meeting in Brussels. |
| 2009 | 27 June | The Pontcysyllte Aqueduct is added to the UNESCO World Heritage List, making it the third World Heritage Site in Wales. |
| 2009 | 22 October | The St David's Centre in Cardiff re-opens as one of the largest shopping centres in the United Kingdom after its multimillion-pound extension and the reconstruction of the surrounding area. |
| 2010 | 18 March | Marriage (Wales) Act 2010 brings the Church in Wales' marriage regulations into line with those of the Church of England. |
| 2010 | 31 March | Digital switchover is completed in Wales when the analogue transmissions at Wenvoe are switched off. Consequently, S4C begins broadcasting solely in Welsh and the channel no longer carries Channel 4 programmes due to Channel 4 becoming available full-time across all of Wales for the first time. |
| 2010 | 12 May | Cardiff-born Conservative MP Cheryl Gillan is confirmed as Secretary of State for Wales in the new UK government, the first woman to hold the post. |
| 2010 | 25 May | The Learned Society of Wales is launched at the National Museum in Cardiff. |
| 2010 | 24 June | Barry-born Julia Gillard becomes Australia's first female prime minister. |
| 2011 | 3 March | A further Welsh devolution referendum is held, which results in the Welsh Assembly receiving full law-making powers on all matters in the twenty fields (subject areas) where it has jurisdiction. |
| 2011 | 5 May | In the 2011 National Assembly for Wales election, Welsh Labour wins exactly half of the contested seats and regains overall power in the Assembly. |
| 2011 | 9 July | The National Museum of Art opens in Cardiff, created with £6.5m of private and Welsh Government funding. |
| 2011 | 1 October | Wales becomes the first UK nation to introduce a minimum 5p charge on single-use plastic carrier bags. |
| 2012 | April | New visitor centre opens at Conwy Castle. |
| 2012 | 26–27 April | Queen Elizabeth II makes a two-day visit to South Wales as part of her Diamond Jubilee tour; the visit includes engagements in Llandaff, Margam, Merthyr Tydfil, Aberfan, Ebbw Vale and Glanusk Park. |
| 2012 | 5 May | Opening of the Wales Coast Path, a long-distance walking route that closely follows the Welsh coastline for 861 miles (1,386 km). |
| 2012 | 25 May | The Olympic Torch starts its five-day tour of Wales, as part of the 2012 Summer Olympics torch relay; Gareth John, the chairman of Disability Sport Wales, is the first person to bring the torch onto Welsh soil. |
| 2012 | 25 July | The first events of the London 2012 Summer Olympics take place in Cardiff: two matches in the women's football competition are held at the Millennium Stadium. |
| 2012 | 12 November | The National Assembly for Wales (Official Languages) Act 2012 receives royal assent; the first bill to be passed under the assembly's new legislative powers, it gives the Welsh and English languages equal status in the assembly. |
| 2012 | 31 December | Rowan Williams retires from the position of Archbishop of Canterbury. |
| 2013 | February | The Brecon Beacons National Park is granted International Dark Sky Reserve status, to restrict artificial light pollution above the park; it is the first such area in Wales, the second in the UK and only the fifth worldwide. |
| 2013 | 2 July | The Welsh Assembly brings into law a presumed consent ("soft opt-out") organ donation scheme, (officially adopted in December 2015). |
| 2013 | 12 September | The Church in Wales passes a bill that will allow women to be consecrated as bishops. |
| 2013 | 14 October | On the centenary of Britain's worst-ever mining disaster, the Welsh National Mining Memorial is unveiled within a dedicated garden at Senghenydd, in memory of all those who have died in the Welsh mines. |
| 2014 | | Excavations carried out by the Clwyd-Powys Archaeological Trust, on parts of Offa's Dyke near Chirk, place construction in the period 541–651 AD, with lower layers dating to as early as 430 AD, suggesting that the Dyke may have been a long-term project by several Mercian kings. |
| 2014 | 29–30 April | Queen Elizabeth II visits South Wales, two years after her previous visit for the Diamond Jubilee; her two-day itinerary includes Narberth, Picton Castle, Pembroke Dock, Ystrad Mynach and Llantwit Major. |
| 2014 | 4–5 September | The 2014 NATO Summit is held at the Celtic Manor Resort in Newport; it is the first NATO summit to be held in the UK since 1990 and the first held anywhere in the UK other than London. |
| 2015 | 15 April | After a £12m restoration project, Cardigan Castle reopens as a heritage attraction and events venue. |
| 2015 | 25 September | Ford approves a new £181 million range of petrol engines to be built at its car manufacturing plant in Bridgend, South Wales, securing 750 skilled jobs at the facility; production of the new engines will begin in 2018. |
| 2015 | 1 December | Wales becomes the first nation in the UK to introduce a presumed consent scheme for organ donation, whereby adults are regarded as consenting to become donors unless they have specifically opted out. |
| 2016 | January | The Millennium Stadium, home of Welsh rugby, is renamed the Principality Stadium. |
| 2016 | 23 June | In the United Kingdom European Union membership referendum, a 52.5% majority of voters in Wales vote to leave the EU, with 47.5% voting to remain. |
| 2017 | 22 February | The British government confirms that MPs will be permitted in future to use the Welsh language during meetings of the Welsh Grand Committee. |
| 2017 | 8 November | Tata Steel announces its intention to invest £30m in its Port Talbot Steelworks, in a bid to safeguard the jobs of 4,000 employees at the plant, following plans to merge with German steel manufacturer ThyssenKrupp. |
| 2018 | 20 March | Planning permission is granted by Neath Port Talbot Council to restart coal production at Aberpergwm Colliery, the last surviving drift mine in Wales, after operations were previously suspended in July 2015. |
| 2018 | 2 July | Prince Charles attends a lowkey ceremony to rename the Second Severn Crossing as the "Prince of Wales Bridge", a move which is widely disliked by the Welsh public. |
| 2019 | January | Completion of a major blast furnace upgrade at the Port Talbot Steelworks after a £50m investment by Tata Steel; this follows years of uncertainty at the plant, with particular concerns over the UK's withdrawal from the European Union. |
| 2019 | 6 June | Ford announces that its Bridgend Engine Plant will close in September 2020, with the loss of 1,700 jobs, blaming reduced global demand for the Ford GTDi 1.5-litre engine. |
| 2019 | 3 July | St Fagans National Museum of History wins the Museum of the Year award for 2019. |
| 2020 | 13 January | The Welsh Government approves the construction of a new bridge across the river Dyfi at Machynlleth, at a cost of £46 million. |
| 2020 | 24 January | The Slate Landscape of North West Wales is nominated by the UK government for consideration as a UNESCO World Heritage Site. |
| 2020 | 28 February | Authorities confirm the first case of COVID-19 in Wales, an individual who recently returned from holiday in Italy. |
| 2020 | 18 March | The Welsh Government announces that all schools in Wales will close from the end of the week as a measure to help contain the spread of COVID-19 in Wales; the school closure lasts until the end of June. |
| 2020 | 12 April | The new, temporary, Dragon's Heart Hospital opens at Cardiff's Millennium Stadium to admit its first COVID-19 patients. |
| 2020 | 6 May | The National Assembly for Wales becomes "Senedd Cymru – Welsh Parliament" and its members become "Members of the Senedd" (MS) (Aelodau o'r Senedd (AS) in Welsh). |
| 2020 | 25 September | Ford's Bridgend Engine Plant closes for decommissioning, ending 40 years of engine production at the site. |
| 2021 | 28 July | The Slate Landscape of North West Wales is added to the UNESCO World Heritage List, making it the fourth World Heritage Site in Wales. |
| 2022 | 8 September | Charles, Prince of Wales, becomes King Charles III of the United Kingdom following the death of his mother, Queen Elizabeth II of the United Kingdom. |
| 2022 | 9 September | William, the elder son of King Charles III, is confirmed as the new Prince of Wales. His wife Catherine becomes Princess of Wales. |
| 2022 | 16 September | King Charles III pays his first visit to Wales as monarch, to meet political leaders and attend a religious service. |