Mountoy Prison is a closed, medium security prison. It is the main committal prison in the State for males aged 18 years and over serving sentences up to life imprisonment.
Mountjoy Prison or Ireland's Model Prison as it was known dates back to 1850. It was designed by Colonel Joshua Jebb, the architect of Pentonville Prison in England. Mountjoy was originally intended as the first stop for men sentenced to transportation where they would spend a period in separate confinement and then be transferred to Spike Island before where they would be transported to Van Diemen's land.