Liam Cosgrave, politician who serves as Taoiseach from February 1973 to July 1977, is born in Castleknock, Dublin, on April 13, 1920.

Cosgrave is the son of William Thomas Cosgrave, the first President of the Executive Council and head of the government of the Irish Free State during the first 10 years of its existence (1922–32). He is educated at Castleknock College, Dublin, studies law at King’s Inns, and is called to the Irish bar in 1943. In that same year he enters Dáil Éireann (the lower house of the Oireachtas, the Irish parliament), and he retains his seat until his retirement from politics in 1981.

In 1948, when the first inter-party government replaces Éamon de Valera’s Fianna Fáil regime, which had been in power for the previous 16 years, Cosgrave becomes Parliamentary Secretary to the Taoiseach and to the Minister for Industry and Commerce. It is a short-lived administration, going out of power in 1951 after three years of rule. But in a second inter-party government (1954–57), he becomes Minister for External Affairs and leads the first Irish delegation to the United Nations General Assembly in 1956.

Cosgrave succeeds James Dillon as leader of the Fine Gael party in 1965. Eight years later, as leader of a coalition government in which Fine Gael combines forces with the Labour Party, he becomes Taoiseach. He and British Prime Minister Edward Heath are the main participants in the intergovernmental conference at Sunningdale in December 1973 that gives birth to Northern Ireland’s first, though short-lived, power-sharing executive (1973–74). A devout Roman Catholic, he is intensely conservative on social issues and shocks his cabinet colleagues by voting against his own government’s bill on liberalizing the sale of contraceptives in 1974. The National Coalition is defeated in the 1977 Irish general election, largely on the economic issues of inflation and unemployment.

Cosgrave retires at the 1981 Irish general election. In 1981, he retires as Dáil Deputy for Dún Laoghaire to be replaced by his son, Liam T. Cosgrave. He reduces his involvement in public life but makes occasional appearances and speeches.

Liam Cosgrave dies at the age of 97 on October 4, 2017, of natural causes. He had been at Tallaght Hospital for several months prior to his death there. His funeral is held on October 7, 2017, after which he is interred alongside his father at Inchicore‘s Goldenbridge Cemetery. He is the longest-lived Taoiseach, dying at the age of 97 years, 174 days.