The Acts of Union 1800 (sometimes incorrectly referred to as a single 'Act of Union 1801') [citation needed] were parallel acts of the Parliament of Great Britain and the Parliament of Ireland which united the Kingdom of Great Britain and the Kingdom of Ireland (previously in personal union) to create the United Kingdom of Great Britain and Ireland.The acts came into force on 1 …

The Kingdom of Great Britain was born on 1 May 1707, shortly after the parliaments of Scotland and England had ratified the Treaty of Union by each approving Acts of Union combining the two parliaments and the powers of the two crowns. Scotland's crown, sceptre, and sword of state remained at Edinburgh Castle.