Question: When did Christianity become the official religion of the foreign group that conquered England around AD 43?

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. though the vikings were eventually neutralised in ireland, their influence remained in the cities of dublin, cork, limerick, waterford and wexford. england however was slowly conquered around the turn of the first millennium ad, and eventually became a feudal possession of denmark. 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. 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. 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. 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> 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. The first Anglo-Saxons arrived as Roman power waned in the 5th century and eventually dominated the bulk of what is now England. Viking invasions began in the 9th century, followed by more permanent settlements and political change—particularly in England. 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. 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. 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. 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. 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. Much of Brittonic-controlled Britain was conquered by the Roman Empire from AD 43. <SEP> the château de falaise is a castle located in the south of the commune of falaise ("cliff" in french) in the "département" of calvados, in the region of normandy, france. william the conqueror, the son of duke robert of normandy, was born at an earlier castle on the same site in about 1028. william went on to conquer england and become king, and possession of the castle descended through his heirs until the 13th century when it was captured by king philip ii of france. <SEP> Constantine's decision to cease the persecution of Christians in the Roman Empire was a turning point for early Christianity, sometimes referred to as the Triumph of the Church, the Peace of the Church or the Constantinian shift. In 313, Constantine and Licinius issued the Edict of Milan decriminalizing Christian worship. The emperor became a great patron of the Church and set a precedent for the position of the Christian emperor within the Church and the notion of orthodoxy, Christendom, ecumenical councils, and the state church of the Roman Empire declared by edict in 380. He is revered as a saint and isapostolos in the Eastern Orthodox Church, Oriental Orthodox Church, and various Eastern Catholic Churches for his example as a ``Christian monarch. '' <SEP> 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. They introduced the Old English language, which largely displaced the previous British language. 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. Raids by Vikings became frequent after about AD 800, and the Norsemen settled in large parts of what is now England. 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. 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.