The Abbot of Lismore (Irish: Lios Mór; Latin: Lismorensis) was the head of Lismore Abbey, which is in modern-day County Waterford, Ireland.[1]
The abbey was founded by Saint Mo Chutu in the early seventh century. After the death of Saint Mo Chutu, the abbots bore the title "Comarbai Mo Chutu" (i.e. "successor of Saint Mo Chutu"). A few of the abbots and others at the monastery were consecrated as bishops. In 1111, Niall mac Meic Áedacáin became the first diocesan bishop of Lismore when the diocese of Lismore was established by the Synod of Ráth Breasail.[1][2]