Na Fianna Éireann (The Fianna of Ireland), known as the Fianna, is an Irish nationalist youth organisation founded by Bulmer Hobson and Constance Markievicz in 1909. Fianna members were involved in the setting up of the armed nationalist body the Irish Volunteers, and had their own circle of the Irish Republican Brotherhood (IRB). They took part in the 1914 Howth gun-running and (as Volunteer members) in the 1916 Easter Rising. They were active in the War of Independence and took the anti-Treaty side in the Civil War.