Monarchy of Ireland and Ireland in a personal union. The Union of the Crowns in 1603 expanded the personal union to include Scotland. The personal union between England and Scotland became a political union with the enactments of the Acts of Union 1707, which created the Kingdom of Great Britain. The crowns of Great Britain and Ireland remained in personal union until it was ended by the Acts of Union 1800, which united Ireland and Great Britain into the United Kingdom of Great Britain and Ireland from January 1801 until December 1922. After that date, most of Ireland left the United Kingdom to
Treaty of Union Treaty of Union The Treaty of Union is the name usually now given to the agreement which led to the creation of the new state of Great Britain, stating that England (which already included Wales) and Scotland were to be "United into One Kingdom by the Name of Great Britain", At the time it was more often referred to as the Articles of Union. The details of the Treaty were agreed on 22 July 1706, and separate Acts of Union were then passed by the parliaments of England and Scotland to put the agreed Articles into effect. The political union