Lorcán Ua Tuathail, known in English as Laurence O'Toole and in French as Laurent d'Eu, was Archbishop of Dublin at the time of the Norman invasion of Ireland. Lorcán played a prominent role in the Irish Church Reform Movement of the 12th century and mediated between the parties during and after the invasion. He was canonised in 1225 by Pope Honorius III.

The Archbishop of Dublin is the head of the Archdiocese of Dublin in the Catholic Church, responsible for its spiritual and administrative needs. The office has existed since 1152, in succession to a regular bishopric since 1028. The archdiocese is the metropolitan see of the ecclesiastical province of Dublin, and the archbishop is also styled the Primate of Ireland. The cathedral church of the archdiocese is Saint Mary's Pro-Cathedral in Dublin city, although the Church formally claims Christ Church as its cathedral, and the archbishop's residence is Archbishop's House in Drumcondra.