The Irish dramatist Sean O'Casey (1880-1964) is considered the greatest of the Irish playwrights who began writing after World War I.

Sean O'Casey was born John Casey on March 31, 1880, the youngest of a large family living in a Dublin slum. He suffered all his life from painful, ulcerated eyeballs and could not read or write until he was 13, having been forced to begin lessons by an interested Irish clergyman. His later experiences among the laboring class in Dublin, where he worked first as an ironmonger, then as a day laborer despite his frail health, gave him a lifelong interest in the problems of the Irish working people. He was a Marxist and took an active part in proletarian reform movements, such as the transport workers strike of 1913, in which he worked with the labor leader Jim Larkin. Arrested as a political prisoner during the Easter Rebellion (1916), he narrowly...