Patrick Joseph McGilligan, lawyer and Cumann na nGaedheal and Fine Gael politician, is born in Hanover Place, Coleraine, County Londonderry on April 12, 1889. He serves as the 14th Attorney General of Ireland from 1954 to 1957, Minister for Finance from 1948 to 1951, Minister for External Affairs from 1927 to 1932 and Minister for Industry and Commerce from 1924 to 1932. He serves as a Teachta Dála (TD) from 1923 to 1965.

McGilligan is the son of Patrick McGilligan, a draper, who serves as Member of Parliament (MP) for South Fermanagh from 1892 to 1895 for the Irish Parliamentary Party, and Catherine O’Farrell. He is educated at St. Columb’s College in Derry, Clongowes Wood College in County Kildare and University College Dublin. He joins Sinn Féin but is unsuccessful in his attempt to be elected as a MP at the 1918 general election. He is called to the bar in 1921.

McGilligan is elected as a Cumann na nGaedheal TD for the National University of Ireland at a by-election held on November 3, 1923. Between 1924 and 1932 he serves as Minister for Industry and Commerce, notably pushing through the Shannon hydroelectric scheme, then the largest hydroelectricity project in the world. In 1927 he sets up the Electricity Supply Board (ESB), and also the Agricultural Credit Corporation.

Also in 1927 McGilligan takes over the External Affairs portfolio following the assassination of Kevin O’Higgins by the anti-Treaty elements of the Irish Republican Army (IRA), in revenge for O’Higgins’ support for the execution of Republican prisoners during the Irish Civil War. In this position he is hugely influential at the Committee on the Operation of Dominion Legislation and at the Imperial Conference in 1930 jointly with representatives of Australia, Canada, New Zealand, South Africa and the United Kingdom. The Statute of Westminster that emerges from these meetings gives greater power to dominions in the Commonwealth like the Irish Free State.

During McGilligan’s period in opposition from 1932 to 1948 he builds up a law practice and becomes professor of constitutional and international law at University College, Dublin. When the National University of Ireland representation is transferred to Seanad Éireann in 1937, he is elected as TD for the Dublin North-West constituency.

In 1948 McGilligan is appointed Minister for Finance in the first Inter-Party Government. As Minister he undertakes some major reforms. He instigates a new approach where Government invests radically in capital projects. Colleagues however complain of his frequent absence from the Cabinet table and the difficulty of contacting him at the Department of Finance. Between 1954 and 1957 he serves as Attorney General. He retires from Dáil Éireann at the 1965 general election, having served for over 40 years.

Patrick McGilligan dies in Dublin on November 15, 1979. Despite his well-known fondness for predicting that he would die young, he reaches the age of ninety. A later Attorney General, John M. Kelly, in the preface to his definitive text, The Irish Constitution (1980), notes the remarkable number of senior judges who are former students of McGilligan and suggests that, given his own firm belief in the value of judicial review, he deserves much of the credit for the remarkable development of Irish law in this field since the early 1960s.