Castleknock College (Coláiste Caisleán Cnucha in Irish) is a private (fee-paying) secondary school for young gentlemen aged between thirteen and eighteen, which is situated in the residential suburb of Castleknock, 8 km west of the city centre in Dublin, Ireland. The history of Castleknock College dates back over 175 years. In 1830, a year after the passing of Catholic Emancipation, priests from the Vincentian Community (Congregation of the Mission, C.M.) in Maynooth College obtained permission to open a day school under the patronage of the Archbishop of Dublin. On the 28 August 1833 a day school at 24 Usher's Quay Dublin was opened. On 28 August 1835, St. Vincent's Ecclesiastical Seminary was opened in Castleknock, a boarding school catering for just 47 boys. The first student to arrive in 1835 was John Lynch of Clones, Co. Monaghan. He would later enter the Vincentian order and become Archbishop of Toronto. A contemporary of John Lynch was Patrick Moran who would also be ordained as a Vincentian priest and become Bishop of Cape Town before being appointed as the first Catholic Bishop of Dunedin (New Zealand) in 1869.