Seán Mac Diarmada

Seán Mac Diarmada
Seán MacDermott
Born(1883-01-27)27 January 1883
Kiltyclogher, County Leitrim, Ireland
Died12 May 1916(1916-05-12) (aged 33)
Kilmainham Gaol, Dublin, Ireland
Cause of deathExecution by firing squad
AllegianceIrish Republican Brotherhood
Irish Volunteers
Years of service1913–1916
RankSupreme Council IRB
Military Committee IRB
Battles / warsEaster Rising
Other workEducator, principal, barrister, republican activist, poet

Seán Mac Diarmada (27 January 1883 – 12 May 1916), also known as Seán MacDermott, was an Irish republican political activist and revolutionary leader. He was one of the seven leaders of the Easter Rising of 1916, which he helped to organise as a member of the Military Committee of the Irish Republican Brotherhood (IRB) and was the second signatory of the Proclamation of the Irish Republic. He was executed for his part in the Rising at age 33.

Brought up in County Leitrim (Kiltyclogher, Glenfarne), he was a member of many associations which promoted the cause of the Irish language, Gaelic revival and Irish nationalism in general, including the Gaelic League and (early in his career) the Irish Catholic fraternity the Ancient Order of Hibernians. He was the national organiser for Sinn Féin, and later manager of the newspaper Irish Freedom, started in 1910 by Bulmer Hobson and others.