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,
Constitution of the United Kingdom two Acts of Union which were passed by the Parliaments of both nations. The Treaty, along with the subsequent Acts, brought into existence the Kingdom of Great Britain, uniting the Kingdom of England and the Kingdom of Scotland. Common law legal systems exist in Northern Ireland and in England and Wales, but not in Scotland which has a hybrid system (see Scots law) which includes a great deal of Common Law. Court judgments also commonly form a source of the constitution: generally speaking in English Law, judgments of the higher courts form "precedents" or "case law" that binds lower courts