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 to unite the two realms so he would not be "guilty of bigamy;" he used the royal prerogative to take the title "King of Great Britain" and give a British character to his court and person. The 1603 Union of England and Scotland Act established a joint Commission to agree terms but the English Parliament was concerned this would lead to the imposition of an absolutist structure similar to that of Scotland. James dropped his policy of a speedy union, the topic disappeared from the legislative agenda while attempts to revive it in 1610 were met with hostility. This did