Seán O'Casey, the Irish playwright and founder member of the Irish Citizen Army, lived in a tenement in no. 35 Mountjoy Square, during the Irish War of Independence. During his time there, it is said that the house was raided by the Black and Tans. John O'Leary, a leading Fenian, poet, editor of "The Irish People", mentioned in W.B. Yeats' poem "September 1913", lived at no. 53 Mountjoy Square West in the late 19th century and early 20th century. Yeats, as a friend of O'Leary, is known to have stayed at 53 Mountjoy Square and sent letters from there. Dáil Éireann, the parliament of Ireland, having been suppressed by the British authorities as a dangerous organisation in September 1919, met before the foundation of the Irish Free State at the home of the republican Walter L. Cole in Mountjoy Square. When the volunteers met on Easter Monday 1916, the 1st battalion met at Blackhall Street in the liberties with the intention of taking over the Four Courts. The exception was the twelve men of D company under the command of Captain Seán Heuston who met at Mountjoy Square with the mission of taking the Mendicity Institution across the river from the four courts. TM Healy resided at 1 Mountjoy Square, having lived previously on the adjacent Great Charles Street in number 50.