History of the Constitution of the United Kingdom
| 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 Constitution of the United Kingdom has evolved over a long period of time beginning in the predecessor states to the United Kingdom and continuing to the present day. The relative stability of the British polity over centuries, progressing without a revolution or regime change that lasted, has obviated the need to write a constitution from first principles, in contrast to many other countries. What Britain has instead is an accumulation of various statutes, judicial precedents, convention, treaties and other sources which collectively can be referred to as the British Constitution. It is thus more accurate to describe Britain’s constitution as an ‘uncodified’ constitution, rather than an ‘unwritten’ one.
Although there is no definitive list of constitutional statutes, there are certain statutes that are significant in the history of the Constitution of the United Kingdom. Some have been repealed, several have been amended and remain in statute, while others are current legislation as originally enacted. None are entrenched.
From the fifth century AD, north Britain was divided into a series of petty kingdoms. Ferocious Viking raids beginning in AD 793 may have speeded up a long-term process of gaelicisation of the Pictish kingdoms, which adopted Gaelic language and customs. There was also a merger of the Gaelic and Pictish kingdoms. This culminated in the rise of Cínaed mac Ailpín (Kenneth MacAlpin) as "king of the Picts" in the 840s (traditionally dated to 843), which brought to power the House of Alpin. When he died as king of the combined kingdom in 900 one of his successors, Domnall II (Donald II), was the first man to be called rí Alban (King of Alba). The term Scotia would increasingly be used to describe the heartland of these kings, north of the River Forth, and eventually the entire area controlled by its kings would be referred to as Scotland. The long reign (900–942/3) of Donald's successor Causantín (Constantine II) is often regarded as the key to formation of the Kingdom of Alba/Scotland, and he was later credited with bringing Scottish Christianity into conformity with the Catholic Church.
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