Máire MacSwiney Brugha, who was the only daughter of republican Terence MacSwiney, has died at the age of 94.
She passed away unexpectedly at her home in Clonskeagh in Dublin.
Mrs MacSwiney Brugha married Ruairí Brugha, the son of revolutionary Cathal Brugha, in 1945. He later became a Fianna Fáil TD.
She wrote a memoir called ''History's Daughter: A Memoir from the Only Child of Terence MacSwiney'', which was published in 2005.
Terence MacSwiney died after 73 days on hunger strike in Brixton Prison in London on 25 October 1920.
Fianna Fáil leader Micheál Martin has expressed his sadness at the news of Mrs MacSwiney Brugha's death.
“I am very saddened to learn of the death of Máire MacSwiney Brugha. She was a woman steeped in republican history and for many years she made a strong and valued contribution to the development of Fianna Fáil," Mr Martin said.