Saint Eunan's College (Irish: Coláiste Adhamhnáin) is an all-male voluntary secondary school. Located in Glencar, Letterkenny (Leitir Ceanainn), County Donegal (Dún na nGall) in the Republic of Ireland, the building is a three-storey castle with four round towers at each corner of the building. The school is named after the Abbot of Iona St. Eunan, a native of Donegal and patron saint of the Diocese of Raphoe. The college celebrated its centenary in 2006. Saint Eunan's College was founded as a boarding school in 1906 by the then Bishop of Raphoe, Patrick O' Donnell. Originally intended as a minor seminary, it was designed to prepare students for the Roman Catholic priesthood. Diocesan colleges became an increasingly popular feature at the time and were designed to give the best possible Catholic education to boys of every class. The student population expanded in the 1920s and it was necessary to build a new extension to the College in the early 1930s. The current recreation hall was built in 1958 and the science block in 1968. The College Chapel was designed by J.J. Robinson, the architect of Galway Cathedral. It was completed in 1961 at a cost of £42,000.