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 a key policy of Queen Anne from the time she acceded to the throne in 1702. Under the aegis of the Queen and her ministers in both kingdoms, the parliaments of England and Scotland agreed to participate in fresh negotiations for a union treaty in 1705. Both countries appointed 31 commissioners to conduct the negotiations. Most of the Scottish commissioners favoured union, and about half were government ministers and other officials. At the head of the list was Queensberry, and the Lord Chancellor of Scotland, the Earl of Seafield. The English commissioners included the Lord High Treasurer, the Earl of