Maynooth (māˈnōth, mānōthˈ) [key], town (1991 pop. 6,027), Co. Kildare, E Republic of Ireland. It is the seat of St. Patrick's College (1795), the principal institution in Ireland for training Roman Catholic clergy, now a constituent college of the National Univ. of Ireland. Some of the buildings were designed by A. W. Pugin. Near the college are the ruins of Maynooth Castle, also called Geraldine Castle, founded c.1176. It was besieged in the reign of Henry VIII and dismantled in the 17th cent.