Liam Pilkington, also known as William Pilkington and Billy Pilkington, is born in Sligo, County Sligo, on June 2, 1894. He is a member of the Irish Republican Army (IRA) during the Irish War of Independence. He is General Officer Commanding (GOC) of the 3rd Western Division, IRA, from 1921 to 1923. After the conclusion of the war he joins the Anti-Treaty IRA during the Irish Civil War. He attempts to become a politician for a short while, but is ultimately unsuccessful. Disillusioned due to the Civil War, he becomes a Catholic priest for the remainder of his life. He serves as a priest in South Africa and Wales before retiring to Liverpool, England, where he spends his remaining days.

Pilkington is born to John Pilkington and Margaret Mary Pilkington (née Torsney), the second of twelve children born to the couple. Only nine of his siblings survive into adulthood. He receives his education at the local Marist Brothers convent school and the Day Trades Preparatory School. Later he is a student at the Department of Agriculture Forestry College in County Wicklow. When the Irish War of Independence begins, the college is closed and he is forced to return to Sligo. He then gains employment with Wehrly Brothers Ltd., a jewelry and watchmaking store in Sligo.

Several notable incidents occur in Pilkington’s military career. On October 25, 1920, at Moneygold, eight miles from Sligo (between Grange and Cliffoney), IRA men led by him ambush a nine-man Royal Irish Constabulary (RIC) patrol, killing four (Sergeant Patrick Perry, Constables Patrick Keown, Patrick Laffey, Patrick Lynch) and wounding two others (Constables Clarke and O’Rourke). In January 1922, he makes clear his opposition to the IRAs General Headquarters (GHQ) support for the Anglo-Irish Treaty. “We intend to cut away from this headquarters, all of you (pointing to the staff and officers of the GHQ) want to build up a Free State Army so you can march in step into the British Empire. Do it openly. We stand by the Republic.” On April 6, 1922, a meeting addressed by Arthur Griffith in Sligo, is proclaimed illegal by Pilkington, who is the local Anti-Treaty IRA divisional commander. His troops take over a number of buildings in the town. Seán Mac Eoin brings Provisional Government troops from Athlone and on the day of the meeting, he is joined by further troops led by J. J. “Ginger” O’Connell. A tense situation ensues but, at the last minute, Pilkington backs down and the meeting goes ahead. On September 4, 1922, an Anti-Treaty IRA unit under Pilkington takes the Dromhaire barracks in County Sligo after the Free State garrison surrenders.

On August 27, 1923, Pilkington runs unsuccessfully in the general election for the 4th Dáil as a Republican candidate, polling 2,089 first preference votes.

Pilkington is a prominent member of the Anti-Treaty IRA for many years, but his most important role as part of the Anti-Treaty IRA comes on April 20, 1923. The Executive of the Anti-Treaty IRA meets in Poulacappal (four miles southwest of Callan and three miles from Mullinahone). Present in addition to Pilkington (who is replacing Liam Lynch) are Frank Aiken, Sean Hyde, Sean Dowling, Bill Quirke, Tom Barry, Tom Ruane (replacing Michael Kilroy), Tom Sullivan (replacing Sean Lehane), Sean McSwiney, Tom Crofts, P. J. Ruttledge and Sean O’Meara (substitute for Séumas Robinson). Frank Aiken is elected Chief-of-Staff and an Army Council of Aiken, Pilkington and Barry is appointed. Aiken proposes that peace should be made with the Pro-Treaty Government on the basis that “the sovereignty of the Irish Nation and the integrity of its territory is inalienable.” This is passed by nine votes to two.

Pilkington becomes a Catholic priest after his foray into politics and due to the disillusionment of the Irish War of Independence. He joins the Redemptorist Order and becomes known as Father William Pilkington CSsR. He serves as a priest in the Archdiocese of Cape Town, South Africa, priest of Monmouthshire, Wales, and retires to Bishop Eton Monastery, Liverpool.

In 1954, Pilkington is guest of honour at a dinner sponsored by Clan na Gael and the IRA Veterans of America in New York City where he says he is returning to the mission fields of Africa, but he remains faithful to the All Ireland Republic. He dies at Bishop Eton Monastery on March 26, 1977, and is buried in Liverpool.