Question: When did the empire that conquered the place that became England begin to fall?

<P0-S0> defeat of the spanish armada, ad 1588 excerpt: ``the england of our own days is so strong, and the spain of our own days is so feeble, that it is not easy, without some reflection and care, to comprehend the full extent of the peril which england then ran from the power and the ambition of spain, or to appreciate the importance of that crisis in the history of the world. '' <SEP> <P1-S0> viking invasions began in the 9th century, followed by more permanent settlements, particularly along the east coast of ireland, the west coast of modern-day scotland and the isle of man. <P1-S1> though the vikings were eventually neutralised in ireland, their influence remained in the cities of dublin, cork, limerick, waterford and wexford. <P1-S2> england however was slowly conquered around the turn of the first millennium ad, and eventually became a feudal possession of denmark. <P1-S3> the relations between the descendants of vikings in england and counterparts in normandy, in northern france, lay at the heart of a series of events that led to the norman conquest of england in 1066. the remnants of the duchy of normandy, which conquered england, remain associated to the english crown as the channel islands to this day. <P1-S4> a century later the marriage of the future henry ii of england to eleanor of aquitaine created the angevin empire, partially under the french crown. <P1-S5> at the invitation of a provincial king and under the authority of pope adrian iv (the only englishman to be elected pope), the angevins invaded ireland in 1169. though initially intended to be kept as an independent kingdom, the failure of the irish high king to ensure the terms of the treaty of windsor led henry ii, as king of england, to rule as effective monarch under the title of lord of ireland. <P1-S6> this title was granted to his younger son but when henry's heir unexpectedly died the title of king of england and lord of ireland became entwined in one person. <SEP> <P2-S0> Hiberni (Ireland), Pictish (northern Britain) and Britons (southern Britain) tribes, all speaking Insular Celtic, inhabited the islands at the beginning of the 1st millennium AD. <P2-S1> The first Anglo-Saxons arrived as Roman power waned in the 5th century and eventually dominated the bulk of what is now England. <P2-S2> Viking invasions began in the 9th century, followed by more permanent settlements and political change—particularly in England. <P2-S3> The subsequent Norman conquest of England in 1066 and the later Angevin partial conquest of Ireland from 1169 led to the imposition of a new Norman ruling elite across much of Britain and parts of Ireland. <P2-S4> By the Late Middle Ages, Great Britain was separated into the Kingdoms of England and Scotland, while control in Ireland fluxed between Gaelic kingdoms, Hiberno-Norman lords and the English-dominated Lordship of Ireland, soon restricted only to The Pale. <P2-S5> The 1603 Union of the Crowns, Acts of Union 1707 and Acts of Union 1800 attempted to consolidate Britain and Ireland into a single political unit, the United Kingdom of Great Britain and Ireland, with the Isle of Man and the Channel Islands remaining as Crown Dependencies. <P2-S6> The expansion of the British Empire and migrations following the Irish Famine and Highland Clearances resulted in the distribution of the islands' population and culture throughout the world and a rapid de-population of Ireland in the second half of the 19th century. <P2-S7> Much of Brittonic-controlled Britain was conquered by the Roman Empire from AD 43. <P2-S8> Most of Ireland seceded from the United Kingdom after the Irish War of Independence and the subsequent Anglo-Irish Treaty (1919–1922), with six counties remaining in the UK as Northern Ireland. <SEP> <P3-S0> The Anglo - Saxons, a collection of various Germanic peoples, established several kingdoms that became the primary powers in present - day England and parts of southern Scotland. <P3-S1> They introduced the Old English language, which largely displaced the previous British language. <P3-S2> The Anglo - Saxons warred with British successor states in Wales, Cornwall, and the Hen Ogledd (Old North; the Brythonic - speaking parts of northern England and southern Scotland), as well as with each other. <P3-S3> The end of Roman rule in Britain facilitated the Anglo - Saxon settlement of Britain, which historians often regard as the origin of England and of the English people. <P3-S4> Raids by Vikings became frequent after about AD 800, and the Norsemen settled in large parts of what is now England. <P3-S5> During this period, several rulers attempted to unite the various Anglo - Saxon kingdoms, an effort that led to the emergence of the Kingdom of England by the 10th century. <SEP> <P4-S0> Relevant dates include 117 CE, when the Empire was at its greatest territorial extent, and the accession of Diocletian in 284. <P4-S1> In 395, after winning two destructive civil wars, Theodosius I died, leaving a collapsing field army and the Empire, still plagued by Goths, divided between his two incapable sons. <P4-S2> By 476 when Odoacer deposed the Emperor Romulus, the Western Roman Emperor wielded negligible military, political, or financial power and had no effective control over the scattered Western domains that could still be described as Roman. <P4-S3> Invading barbarians had established their own power in most of the area of the Western Empire. <P4-S4> While its legitimacy lasted for centuries longer and its cultural influence remains today, the Western Empire never had the strength to rise again. <P4-S5> Irreversible major territorial loss, however, began in 376 with a large - scale irruption of Goths and others.