1. Lily O'Brennan's father died in 1880, her mother in 1930.

1. Lily O'Brennan's father died in 1880, her mother in 1930.
Lily O'Brennan became a teacher and contributed to both Irish and American periodicals.
Lily O'Brennan wrote a play, May Eve in Stephen's Green, produced with Maire Nic Shiubhlaigh and performed in Father Mathew Hall, Church Street, Dublin in 1912; it was inspired by a statue of James Clarence Mangan in St Stephen's Green.
Lily O'Brennan attended the inaugural meeting of Cumann na mBan, held in Wynn's Hotel, Dublin, and was a member of its central branch.
When Cumann na mBan split due to the start of World War I the Lily O'Brennan's sided against the proposal to volunteer with the British.
Lily O'Brennan bought the makings of the flag for the 4th Battalion of the Irish Volunteers and made the first aid kits.
Lily O'Brennan was stationed in the Marrowbone Lane distillery under the command of Con Colbert and remained there all week.
Lily O'Brennan was arrested with the garrison there and held at Richmond Barracks and Kilmainham Gaol.
Lily O'Brennan worked as a clerk for the National Aid Association later the Prisoner's Dependents Fund as well as locating and marking the graves of those killed during the Rising.
Lily O'Brennan was one of the two delegation secretaries for the 1921 treaty delegation.
Mary MacSwiney proposed Lily O'Brennan to be appointed as a plenipotentiary to the negotiations but she was thought to be "too extreme".
Lily O'Brennan lived in 22 Hans Place, Brompton, London and worked for Arthur Griffith as his secretary for a time in 1922.
Lily O'Brennan worked on the staff of the Republican headquarters, secretary to Erskine Childers.
Lily O'Brennan was arrested there in November 1922 and imprisoned in Mountjoy Prison, then moved to Kilmainham on 6 February 1923 where she spent three months.
Lily O'Brennan was however released only a few weeks later.
Lily O'Brennan was a founder member of the Catholic Writers Guild in 1947.
Lily O'Brennan died on 31 May 1948 and was buried in the Deansgrange cemetery.
Lily O'Brennan's papers are in the University College Dublin Archives.