Seán Mac Diarmada (1883-1916) was one of the Seven Signatories of the Proclamation of the Irish Republic. A key figure in the Irish Republican Brotherhood working alongside his close friend, the veteran Fenian Tom Clarke, Mac Diarmada helped to organise the Easter Rising. Mac Diarmada had been afflicted with polio as a young man and as a result of such disability, he was unable to take much part in the fighting on Easter Week, however was stationed in the General Post Office. Following the surrender of the rebels, Mac Diarmada was court martialled and executed alongside the other signatories of the Proclamation. Mac Diarmada was executed on 12th May 1916, in Kilmainham Jail.