August 1, 1800

Acts of Union 1800

The Irish Act of Union receives royal assent in Dublin

George III did not perform the act the listing names. Lord Lieutenant Cornwallis granted the assent in Dublin on the Crown's behalf, and the Irish Parliament was still alive to meet once more the next day.

Assent in Dublin, by a deputy

Royal assent was granted in Dublin on 1 August 1800 to the Irish Parliament's Act for the Union of Great Britain and Ireland, 40 Geo. III c. 38. Charles Cornwallis, Lord Lieutenant of Ireland, gave it on the Crown's behalf.

George III had assented personally in London to the parallel British statute on 2 July. Calling the Irish measure the "second Act of Union" is informal: these were parallel statutes enacted by two different parliaments, not officially numbered acts.

Nor was 1 August the day the Irish houses passed the bill. Both had accepted the union terms on 28 March and the detailed Irish bill passed in June; 1 August was enactment by assent.

What the Articles actually settled

The Irish Commons had accepted the terms by 158 votes to 115. Ireland was to send 100 MPs to the future House of Commons, and to the Lords 28 representative peers for life plus 4 rotating Church of Ireland bishops.

The financial formula gave Ireland two of every seventeen parts of joint expenditure for twenty years. Eighty-four Irish pocket boroughs lost representation, and their patrons were compensated for what the political system treated as property.

Catholic emancipation was an associated political expectation, not a provision or formal promise inside the enacted Articles of Union; it was not achieved until 1829.

Nothing changed that night

The United Kingdom did not come into being on assent day. Both statutes were now law, but the union was scheduled to take effect on 1 January 1801.

The Irish legislature still existed on 1 August and met for the last time on 2 August, when Cornwallis addressed it at its final sitting.

The new royal style, the altered royal arms, the removal of the French fleur-de-lis and the present Union Flag all took effect by proclamation on 1 January 1801, and the first Parliament of the United Kingdom met on 22 January 1801.

Sources

Researched 24 Aug 2026 7 sources not yet audited

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What the sources leave uncertain

“Second Act of Union” is informal and potentially misleading: these were parallel statutes enacted by different parliaments, not officially numbered first and second acts.
The listed title incorrectly makes George III the physical actor on 1 August. Cornwallis granted assent in Dublin under royal authority.
Sources sometimes use “passed” loosely for the assent date. The Irish houses had completed passage earlier; 1 August was enactment by royal assent.