Terence, then a Sinn Féin Teachta Dála (TD) and the Lord Mayor of Cork, died on hunger strike in 1920. He was elected at the 1921 elections for the Cork Mid, North, South, South East and West constituency and became a member of the Second Dáil. His sister Mary was elected for the Cork Borough constituency at the same election.
He opposed the Anglo-Irish Treaty and voted against it (as did his sister Mary). During the Irish Civil War, he was quartermaster for the 1st Southern Division of the anti-Treaty IRA and served on the IRA executive. He evaded capture until after the IRA called a ceasefire, and in November 1923 he was arrested in Kerry and interned.
He died, aged 63, at Glenvera private hospital, Cork.
- "General Registrar's Office". IrishGenealogy.ie. Retrieved 20 April 2017.
- "Death of Seán MacSwiney of Cork". Irish Press. 23 January 1942. Retrieved 21 April 2017.
- "Mr. Seán MacSwiney". Oireachtas Members Database. Retrieved 11 April 2009.
- "Seán MacSwiney". ElectionsIreland.org. Retrieved 11 April 2009.
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