Union of the crowns

Treaty of Windsor	1175
Treaty of York	1237
Treaty of Perth	1266
Treaty of Montgomery	1267
Treaty of Aberconwy	1277
Statute of Rhuddlan	1284
Treaty of Edinburgh–Northampton	1328
Treaty of Berwick	1357
Poynings' Law	1495
Laws in Wales Acts	1535–42
Crown of Ireland Act	1542
Treaty of Edinburgh	1560
Union of the Crowns	1603
Union of England and Scotland Act	1603
Act of Settlement	1701
Act of Security	1704
Alien Act	1705
Treaty of Union	1706
Acts of Union	1707
Personal Union of 1714	1714
Wales and Berwick Act	1746
Irish Constitution	1782
Acts of Union	1800
Government of Ireland Act	1920
Anglo-Irish Treaty	1921
Royal and Parliamentary Titles Act	1927
N. Ireland (Temporary Provisions) Act	1972
Northern Ireland Assembly	1973
N. Ireland Constitution Act	1973
Northern Ireland Act	1998
Government of Wales Act	1998
Scotland Act	1998
Government of Wales Act	2006
Scotland Act	2012
Edinburgh Agreement	2012
Wales Act	2014
Scotland Act	2016
Wales Act	2017

The Union of the Crowns (Scottish Gaelic: Aonadh nan Crùintean; Scots: Union o the Crouns) was the accession of James VI, King of Scots, to the thrones of England and Ireland, and the consequential unification for some purposes (such as overseas diplomacy) of the three realms under a single monarch on 24 March 1603. The Union of Crowns followed the death of Elizabeth I of England — the last monarch of the Tudor dynasty, who was James's unmarried and childless first cousin twice removed.

The Union was a personal or dynastic union, with the Crown of Scotland remaining both distinct and separate—despite James's best efforts to create a new "imperial" throne of "Great Britain". However, England and Scotland would continue to be sovereign 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, Queen Anne.