Mountjoy Prison, founded as Mountjoy Gaol and nicknamed The Joy, is a medium security men's prison located in Phibsborough in the centre of Dublin, Ireland. The current prison Governor is Ray Murtagh.

Seán Mac Eoin was an Irish Fine Gael politician and soldier who served as Minister for Defence briefly in 1951 and from 1954 to 1957, Minister for Justice from 1948 to 1951, and Chief of Staff of the Defence Forces from February 1929 to October 1929. He served as a Teachta Dála (TD) from 1921 to 1923, and from 1929 to 1965.