Acts of Union 1800

Union with Ireland Act 1800

Citation 39 & 40 Geo. 3 c. 67
Territorial extent Great Britain
Status: Current legislation
Revised text of statute as amended
Act of Union (Ireland) 1800

Citation 40 Geo. 3 c.38
Introduced by John Toler[1]
Territorial extent Ireland
Other legislation
Repealed by Statute Law Revision (Pre-Union Irish Statutes) Act, 1962 (Rep. I.)
Relates to An Act to regulate the Mode by which the Lords Spiritual and Temporal, and the Commons, to serve in the Parliament of the United Kingdom on the Part of Ireland shall be summoned and returned to the said Parliament (40 Geo. 3 c.29)
Status: Current legislation
Revised text of statute as amended
Documents relevant to personal
and legislative unions of the
countries 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 153542
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
Scotland Act 2016

The Acts of Union 1800 (sometimes erroneously referred to as a single Act of Union 1801) 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[2] with effect from 1 January 1801. Both Acts, though since amended, still remain in force in the United Kingdom,[3] but have been repealed in the Republic of Ireland.[4][5]


Two acts with the same long title, 'An Act for the Union of Great Britain and Ireland' were passed in 1800; the short title of the act of the Irish Parliament is 'Act of Union (Ireland) 1801', and that of the British Parliament is 'Union with Ireland Act 1801'.


Before these Acts, Ireland had been in personal union with England since 1541, when the Irish Parliament had passed the Crown of Ireland Act 1542, proclaiming King Henry VIII of England to be King of Ireland. (Before then, since the 12th century, the King of England had been overlord of the Lordship of Ireland, a papal possession.) Both Ireland and England had come in personal union with Scotland with the Union of the Crowns in 1603.

In 1707, the Kingdom of England and the Kingdom of Scotland were united into a single kingdom: the Kingdom of Great Britain. Upon that union, each House of the Parliament of Ireland passed a congratulatory address to Queen Anne, praying that, "May God put it in your royal heart to add greater strength and lustre to your crown, by a still more comprehensive Union".[6] The Irish parliament at that time was subject to a number of restrictions that placed it subservient to the Parliament of England (and following the union of England and Scotland, the Parliament of Great Britain).

In the century that followed the union of England and Scotland, Ireland gained effective legislative independence from Great Britain through the Constitution of 1782. However, access to institutional power in Ireland was restricted to a small minority, the so-called Anglo-Irish of the Protestant Ascendancy, and frustration at the lack of reform eventually led to a rebellion in 1798, involving a French invasion of Ireland and seeking complete independence from Great Britain. The rebellion was crushed with much bloodshed, and the subsequent drive for union between Great Britain and Ireland that passed in 1800 was motivated at least in part by the belief that the rebellion was caused as much by loyalist brutality as by the United Irishmen.

Passing the Acts

Each Act had to be passed in the Parliament of Great Britain and the Parliament of Ireland.

After centuries of subordination to the English, and later, British Parliaments, the Parliament of Ireland gained a large measure of independence by the Constitution of 1782. Many members of the Irish Parliament jealously guarded its autonomy (notably Henry Grattan) and a motion for union was rejected in 1799. However, a concerted campaign by the British government overcame the reluctance of the Irish Parliament.

Only Anglicans were permitted to become members of the Parliament of Ireland, though the great majority of the Irish population were Roman Catholic, with many Presbyterians in Ulster. In 1793 Roman Catholics regained the right to vote if they owned or rented property worth £2 p.a. The Catholic hierarchy was strongly in favour of union, hoping for rapid emancipation – the right to sit as MPs – which was however delayed until 1829.

From the perspective of Great Britain, the union was required because of the uncertainty that followed the Irish Rebellion of 1798 and the French Revolution of 1789, which inspired the rebels; if Ireland adopted Catholic Emancipation, willingly or not, a Roman Catholic parliament could break away from Britain and ally with the French, while the same measure within a united kingdom would exclude that possibility. Also the Irish and British parliaments, when creating a regency during King George III's "madness", gave the Prince Regent different powers. These considerations led Great Britain to decide to merge the two kingdoms and their parliaments.

The final passage of the Act in the Irish Parliament was achieved with substantial majorities, achieved in part according to contemporary documents through bribery, namely the awarding of peerages and honours to critics to get their votes.[7] Whereas the first attempt had been defeated in the Irish House of Commons by 109 votes against to 104 for, the second vote in 1800 produced a result of 158 to 115.[7]


The Acts of Union were two complementary Acts, namely:

They were passed on 2 July 1800 and 1 August 1800 respectively, and came into force on 1 January 1801. They ratified eight articles which had been previously agreed by the British and Irish Parliaments:

Part of the attraction of the Union for many Irish Catholics was the promise of Catholic Emancipation, allowing Roman Catholic MPs, who had not been allowed in the Irish Parliament. This was however blocked by King George III who argued that emancipating Roman Catholics would breach his Coronation Oath, and was not realised until 1829.

The first parliament

In the first Parliament of the United Kingdom of Great Britain and Ireland, the members of the House of Commons were not elected afresh. By royal proclamation authorised by the Act, all the members of the last House of Commons from Great Britain took seats in the new House, and from Ireland 100 members were chosen from the last Irish House of Commons; both members from each of the 32 counties and from the two largest boroughs, and one each (chosen by lot) from the next 31 boroughs and from Dublin University.

Union flag

The second Union Flag

The flag, created as a consequence of the union of the Kingdom of Great Britain and Ireland in 1800, still remains the flag of the United Kingdom. Called the Union Flag, it combined the flags of St George's Cross (which included Wales) and the St Andrew's Saltire of Scotland with the St Patrick's Saltire to represent Ireland (it now represents Northern Ireland).





  1. "Bill 4098: For the union of Great Britain and Ireland". Irish Legislation Database. Belfast: Queen's University. Retrieved 28 April 2015.
  2. Act of Union 1707, Article 2.
  3. Search results - UK Statute Law Database. Retrieved 6 September 2015.
  4. Republic of Ireland – Statute Law Revision Act 1983, "Repeals"
  5. The Statute Law Revision (Pre-Union Irish Statutes) Act 1962, section 1 and Schedule
  6. Journals of the Irish Commons, vol. iii. p. 421
  7. 1 2 Alan J. Ward, The Irish Constitutional Tradition p.28.
  8. Union with Ireland Act 1800, No. (39 & 40 Geo. 3 c. 67) of 2 July 1800 (in English). Retrieved on 6 September 2015.
  9. Act of Union (Ireland) 1800, No. (40 Geo. 3 c. 38) of 1 August 1800 (in English). Retrieved on 6 September 2015.

External links

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