Union of the Crowns create a new "imperial" throne of "Great Britain". England and Scotland continued as autonomous states sharing a monarch with Ireland (with an interregnum in the 1650s during the republican unitary state of the Commonwealth and the Protectorate), until the Acts of Union of 1707 during the reign of the last Stuart monarch, Anne. In August 1503, James IV of Scotland married Margaret, eldest daughter of Henry VII of England, and the spirit of the new age was celebrated by the poet William Dunbar in "The Thrissil and the Rois". The marriage was the outcome of the Treaty of Perpetual Peace,
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