Born in Wexford in 1877. As a young man, O’Hanrahan showed great promise as a writer, becoming heavily involved in the promotion of the Irish language. He founded the first Carlow branch of the Gaelic League, and published two novels, A Swordsman of the Brigade and When the Norman Came. Like many of the other executed leaders, he joined the Irish Volunteers from their inception, and was second in command to Thomas MacDonagh at Jacob’s biscuit factory during the Rising, although this position was largely usurped by the arrival of John MacBride. His execution took place on 4 May 1916.