query: What is the oldest cathedral in Dublin?
passage: Christ Church Cathedral, Dublin
Christ Church Cathedral, more formally The Cathedral of the Holy Trinity, is the cathedral of the United Dioceses of Dublin and Glendalough and the cathedral of the ecclesiastical province of the United Provinces of Dublin and Cashel in the (Anglican) Church of Ireland.[1] It is situated in Dublin, Ireland, and is the elder of the capital city's two medieval cathedrals, the other being St Patrick's Cathedral.
passage: Roman Catholic Archdiocese of Dublin
The founding Archbishop – Gregory – was consecrated at Lambeth. His suffragan sees were Kildare, Ossory, Leighlin, Ferns and Glendalough. The second archbishop, from 1161 to 1179, was Saint Lorcán O'Toole, previously Abbot of Glendalough, who had been elected as Bishop of Glendalough in 1162. During his time in office, the presence of the Church grew in Dublin city (by 1170 there were six churches other than the cathedral within the walls) and religious orders from the continent came to Ireland (Augustinians, Dominicans, Franciscans and Carmelites had houses in Dublin, and the great convent of Grace Dieu, near Donabate, was also founded). As part of this trend, Lorcán installed a community of canons to minister according to the Aroasian (reformed Augustinian) Rule in the Cathedral of the Holy Trinity (later known as Christ Church). The Abbey of Saint Mary, one of the most important religious houses in Ireland for centuries, was founded in Dublin at that time, first under the Benedictine Rule, then passing to the Cistercians.