Which British Prime Minister signed the Anglo-Irish Agreement?

Margaret Hilda Thatcher, Baroness Thatcher (née Roberts; 13 October 1925 – 8 April 2013) was a British stateswoman who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold that office.

The Anglo-Irish Agreement was a 1985 treaty between the United Kingdom and Ireland which aimed to help bring an end to the Troubles in Northern Ireland. The treaty gave the Irish government an advisory role in Northern Ireland's government while confirming that there would be no change in the constitutional position of Northern Ireland unless a majority of its people agreed to join the Republic. It also set out conditions for the establishment of a devolved consensus government in the region.

The Agreement was signed on 15 November 1985 at Hillsborough Castle, by the British Prime Minister, Margaret Thatcher, and the Irish Taoiseach, Garret FitzGerald.