History of the formation of the United Kingdom Kingdom of England (which included Wales and controlled Ireland) and the Kingdom of Scotland. The once independent Principality of Wales fell under the control of English monarchs from the Statute of Rhuddlan in 1284. The Union of Crowns in 1603, the accidental consequence of a royal marriage one hundred years earlier, united the kingdoms in a personal union, though full political union in the form of the Kingdom of Great Britain required a Treaty of Union in 1706 and Acts of Union in 1707 (to ratify the Treaty). The Act of Union 1800 united the Kingdom of Great Britain with
Acts of Union 1707 not mean James abandoned the idea; 17th-century religion and politics were closely linked and he viewed a unified Church of Scotland and England as the first step towards a centralised, Unionist state. The problem was that the two churches were very different in both structure and doctrine; Scottish bishops presided over Presbyterian structures but were doctrinal Calvinists who viewed many Church of England practices as little better than Catholicism. The religious policies followed by James and his son Charles I were intended as precursors to political union; resistance to this concept led to the 1638 National Covenant in Scotland and