Title: Iorwerth Drwyndwn
Content:  Iorwerth mab Owain Gwynedd (or Iorwerth Drwyndwn meaning "the flat-nosed"), also called Edward (c. 1130–1174), was the eldest legitimate son of Owain Gwynedd (the king of Gwynedd) and his first wife Gwladys (Gladys) ferch Llywarch. He married Marared ferch Madog. His son, Llywelyn the Great, eventually united the realm and became known as Llywelyn Fawr and is one of Wales's most famous monarchs. Iorwerth received Nant Conwy as his inheritance from his father, Owain Gwynedd. However, he did not receive the crown succession, as was the normal tradition, because of his nose defect (his sobriquet 'Trwyndwn' means broken-nosed).
Title: Iorwerth Drwyndwn
Content:  He was killed in battle at Pennant Melangell, in Powys, during the wars deciding the succession following the death of his father.
Title: Llywelyn the Great
Content:  eldest surviving son. There is a tradition that he was disabled or disfigured in some way that excluded him from power. J. E. Lloyd states that Iorwerth was killed in battle at Pennant Melangell, in Powys, in 1174 during the wars deciding the succession following the death of his father. By 1175, Gwynedd had been divided between two of Llywelyn's uncles. Dafydd ab Owain held the area east of the River Conwy and Rhodri ab Owain held the west. Dafydd and Rhodri were the sons of Owain by his second marriage to Cristin verch Goronwy. This marriage was not considered valid by the church as Cristin was Owain's first cousin, a degree of relationship which according to Canon law prohibited marriage. Giraldus Cambrensis refers to Iorwerth Drwyndwn as the only legitimate son 
Title: Iorwerth
Content: Iorwerth Beli (fl. second half of the 14th century), Welsh language poet ; Iorwerth ap Bleddyn (1053–1111), prince of Powys in eastern Wales ; Iorwerth Drwyndwn (1145–1174), son of Owain Gwynedd, king of Gwynedd ; Iorwerth (bishop of St David's) (fl. 1215) ; Thomas Iorwerth Ellis OBE (1899–1970), Welsh classicist and author ; Iorwerth Evans (1906–1985), rugby union footballer of the 1930s ; Iorwerth Hirflawdd, ancestor of various medieval rulers in mid Wales ; Llywelyn ap Iorwerth (1172–1240), Llywelyn the Great, de facto ruler over most of Wales ; Iorwerth Isaac (1911–1966), Welsh dual-code international rugby flanker ; Iorwerth Jones (1903–1983), Welsh rugby union and professional rugby league footballer ; Iorwerth Peate (1901–1982), Welsh poet and scholar ; Iorwerth Thomas (1895–1966), Welsh Labour Party politician ; Rhun ap Iorwerth, Plaid Cymru Assembly Member for Ynys Môn Iorwerth is a Welsh name, composed of two elements: iôr meaning "lord" and berth meaning "fair", "fine", or "handsome". (Both morphemes are somewhat archaic in Modern Welsh.) The name has historically been associated with the name Edward, although the names do not have a common origin and neither name is a translation of the other. Bearers of the name include:
Title: Llywelyn the Great
Content:   Llywelyn was born about 1173, the son of Iorwerth ab Owain and the grandson of Owain Gwynedd, who had been ruler of Gwynedd until his death in 1170. Llywelyn was a descendant of the senior line of Rhodri Mawr and therefore a member of the princely house of Gwynedd. He was probably born at Dolwyddelan the royal manor of Nanyconwy, though not in the present Dolwyddelan Castle, which was built by Llywelyn himself. He may have been born in the old castle which occupied a rocky knoll on the valley floor. Little is known about his father, Iorwerth Drwyndwn, who died when Llywelyn was an infant. There is no record of Iorwerth having taken part in the power struggle between some of Owain Gwynedd's other sons following Owain's death, although he was 
Title: Kingdom of Gwynedd
Content:  King of the Isles, and then driven out once more at the beginning of 1194, sharing the humiliation of his brother Dafydd ab Owain. Dafydd Ist had a nemesis in his nephew Llywelyn ap Iorwerth,  who was born most likely in the year 1173 and therefore only a child when all these events played out. Llywelyn's father Iorwerth Drwyndwn had been involved in the early stages of the dynastic struggles and most likely died sometime around 1174, during the same time as the usurpation of Dafydd I. As the century drew to a close Llywelyn became a young man and decided to stake his 
Title: Penmachno
Content:  the large enclosure of the church that is now the graveyard (about 100 m by 75 m), suggests there was a religious community here, probably a clas. It has been suggested that Iorwerth ab Owain Gwynedd (1145-1174), also known as Iorwerth Drwyndwn, the father of Llywelyn the Great, was buried in the oldest church, and that a sixth stone slab in the present church (a 13th-century gravestone) marked his grave. The church is kept locked; the key can be obtained by asking at a neighbouring house. The holy well of St Tudclud is in the cellar of the old Post Office, now a private dwelling.
Title: Iorwerth ap Bleddyn
Content:  Iorwerth ap Bleddyn (1053–1111) was a prince of Powys in eastern Wales. Iorwerth was the son of Bleddyn ap Cynfyn who was king of both Powys and Gwynedd. When Bleddyn was killed in 1075, Powys was divided between three of his sons, Iorwerth, Cadwgan and Maredudd. Iorwerth, Cadwgan and Maredudd held their lands as vassals of Robert of Bellême, 3rd Earl of Shrewsbury. In 1102 the Earl was summoned to answer charges at the court of King Henry I of England and responded by rising in rebellion against the king. All three brothers initially supported Robert and took up arms on his behalf, pillaging Staffordshire. The king deputed William Pantulf to detach 
Title: Iorwerth Hirflawdd
Content:  Iorwerth Hirflawdd was an ancestor of various medieval rulers in mid Wales. His epithet means 'long trouble', but nothing is known of how he acquired it, nor otherwise of his life. Nothing is known certainly of his life, but he must have lived in the mid 9th century. Elystan Glodrydd (died c.1010), who is regarded as the founder of the fifth Royal Tribe of Wales, was seventh in descent from him. He also appears near the head of a dynasty of Arwystli, where he is named as son of Tegonwy ap Teon. Tegonwy also appears in the genealogy of Bleddyn ap Cynfyn, who was the ancestor of the later Princes of Powys. Bleddyn's claim to rule came from his father Cynfyn, being a Powys nobleman, Interim King of Powys and maternal grandson of the former King Cadell.
Title: Gruffudd ap Llywelyn ap Iorwerth
Content:  Gruffudd ap Llywelyn ap Iorwerth (c. 1196 – 1 March 1244) was the Welsh first-born son of Llywelyn the Great ("Llywelyn Fawr"). His mother Tangwystl (c. 1180/1185 – c. 1210) probably died in childbirth.

Question: Who is the father of Iorwerth Drwyndwn?
Answer: Owain Gwynedd.