Question: When did Christianity become the official religion of the empire that conquered Halford Mackinder's birthplace around AD 43?

<P0-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. <P0-S1> Much of Brittonic-controlled Britain was conquered by the Roman Empire from AD 43. <P0-S2> The first Anglo-Saxons arrived as Roman power waned in the 5th century and eventually dominated the bulk of what is now England. <P0-S3> Viking invasions began in the 9th century, followed by more permanent settlements and political change—particularly in England. <P0-S4> 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. <P0-S5> 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. <P0-S6> 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. <P0-S7> 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. <P0-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> <P1-S0> The Royal Geographical Society of London and other geographical societies in Europe had great influence and were able to fund travelers who would come back with tales of their discoveries. <P1-S1> These societies also served as a space for travellers to share these stories.Political geographers such as Friedrich Ratzel of Germany and Halford Mackinder of Britain also supported imperialism. <P1-S2> Ratzel believed expansion was necessary for a state’s survival while Mackinder supported Britain’s imperial expansion; these two arguments dominated the discipline for decades. <SEP> <P2-S0> the halford special was a grand prix racing car of the 1920s built by engine designer major frank halford on the chassis of an early side valve aston martin tourer. <P2-S1> it was one of the most advanced british-built racing cars of the mid-1920s and had many racing successes. <P2-S2> halford himself was a freelance engine designer who did work for both the de havilland aircraft company and napier & son. <SEP> <P3-S0> archaeological finds suggest that the area has been inhabited since the stone age. <P3-S1> following the roman invasion of britain in ad 43 and the conquering of the local britons in 70 ad the fortress settlement of clausentum was established. <P3-S2> it was an important trading port and defensive outpost of winchester, at the site of modern bitterne manor. <P3-S3> clausentum was defended by a wall and two ditches and is thought to have contained a bath house. <P3-S4> clausentum was not abandoned until around 410. <SEP> <P4-S0> 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. <P4-S1> In 313, Constantine and Licinius issued the Edict of Milan decriminalizing Christian worship. <P4-S2> 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. <P4-S3> 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. ''