Archbishop of Dublin. Laurence (Lorcan O Tuathail) was born about 1128 in Co Kildare, of a marriage between the chieftain families O'Toole and O'Byrne. He spent most of his childhood as a hostage of Dermot McMurrogh, King of Leinster. Laurence became a monk at Glendalough and was elected abbot at the age of 25.