Act of Union 1800 creates the United Kingdom of Great Britain and Ireland
- When
- 1800–1801
- Where
- London; Dublin
- Episodes
- 4
The Acts of Union 1800 united Great Britain and Ireland into the United Kingdom, effective 1 January 1801. This abolished the Parliament of Ireland, merging legislatures. The union was driven by security concerns following the 1798 rebellion. Political fallout included William Pitt's resignation over Catholic emancipation, succeeded by Henry Addington.
Episodes
- Abolition of the Parliament of Ireland
The Parliament of Ireland was abolished entirely on 31 December 1800, merging legislatures into a single Parliament of the United Kingdom.
- Creation of the United Kingdom
The Acts of Union 1800 united Great Britain and Ireland into a single sovereign state, effective 1 January 1801.
- Pitt's Resignation
William Pitt resigned as Prime Minister in March 1801 over King George III's refusal to grant Catholic emancipation.
- Addington Takes Office
Henry Addington became Prime Minister in 1801, serving until 1804, succeeding Pitt.
Background and detail
Background. The union was motivated by British elite concerns following the French Revolution and the Irish Rebellion of 1798. The rebellion destroyed Pitt's faith in the Dublin parliament's competence. King George III supported the union, advising Pitt to use the rebellion to frighten supporters into accepting it. The acts were parallel laws passed by both parliaments to create a single sovereign state.
Legislative Process. Two acts with identical aims were passed by the respective parliaments. The British Act received royal assent on 2 July 1800, and the Irish Act on 1 August 1800. The terms were agreed by the Irish Parliament on 28 March 1800. The provisions came into force on 1 January 1801, abolishing the Parliament of Ireland and merging legislatures.
Political Consequences. Pitt sought to secure Catholic emancipation as part of the union, but failed. He resigned in March 1801, ostensibly over King George III's refusal to remove political restrictions on Roman Catholics. Henry Addington, previously Speaker of the House of Commons, became Prime Minister, serving from 1801 to 1804.
People involved
- William Pitt the Younger · Prime Minister of Great Britain and first Prime Minister of the United Kingdom
- Henry Addington · Prime Minister of the United Kingdom (1801-1804)
- King George III · Monarch who supported the union and opposed Catholic emancipation
- Henry Grattan · Member of the Irish Parliament who guarded autonomy
Sources
- Acts of Union 1800 Wikipedia, revision of 2026-09-07
- Parliament of Ireland Wikipedia
- William Pitt the Younger Wikipedia, revision of 2026-09-13
- Henry Addington Wikipedia, revision of 2026-09-13
- United Kingdom of Great Britain and Ireland Wikipedia, revision of 2026-09-30
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.