He was chaplain to King Henry II of England and on his "urgent" recommendation was elected Archbishop of Dublin following the death of St. Laurence O'Toole in 1180.
He was not then a priest, but was subsequently, in the same year, ordained such, at Velletri, and on Palm Sunday (21 March) was there consecrated archbishop by Pope Lucius III.
[1] Comyn waited three years before visiting Ireland, until he was sent there by King Henry to prepare the reception of his son, Prince John.
[1] Comyn died six years later and was buried in Christ Church Cathedral, where a marble monument was erected to his memory.
Two years later William Piro, Bishop of Glendalough, died, whereupon the union of the sees granted by King John took place.