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 restore him to the English throne. Defeat in the 1649–1651 Third English Civil War or Anglo-Scottish War resulted in Scotland's incorporation into the Commonwealth of England, Scotland and Ireland, largely driven by Cromwell's determination to break the power of the kirk, which he held responsible for the Anglo-Scottish War. The 1652 Tender of Union was followed on 12 April 1654 by "An Ordinance by the Protector for the Union of England and Scotland," creating the Commonwealth of England, Scotland and Ireland. It was ratified by the Second Protectorate Parliament on 26 June 1657, creating a single Parliament in Westminster, with