Seán O’Duffy was born in 1886 in Cill an Bhaile, County Mayo and later moved to Dublin in 1900. O’Duffy had a strong interest in sports and became a soccer player and referee in 1910. He became a founder of the Crokes GAA Club and became a GAA referee. He also had an avid interest in Camogie and was present at the reorganization of the Camogie Association under the auspices of the Crokes club in 1910. O’Duffy was also involved in political activities and partook in the Dublin Lock-out in 1913, a strike led by Jim Larkin. He joined the Irish Volunteers and took part in the 1916 Easter Rising and fought for the entire week. He was arrested and imprisoned after the rising in Stafford Jail until August 1916. In 1917 he was promoted to Captain for his assistance in Irish intelligence work with Michael Collins. He was part of the Irish Republican Army from 1919 until 1921 and eventually returned to civilian life in Dublin and joined the Irish Civil Service in 1925. He died on 20 October 1981 in Meath Hospital.