On the death of
Fedelmid Find, the Bishop of Armagh on 30 October 578, Carláen was appointed as the 12th Bishop in succession to
Saint Patrick. The Annals of the Four Masters for 457 AD state- "
Ard Mhacha was founded by Saint Patrick, it having been granted to him by Daire, son of Finnchadh, son of Eoghan, son of Niallan." So Carláen's appointment was probably due to the influence of his family as the original grantors of the land and several Bishops of Armagh came from this same family. Carláen reigned as Bishop for a decade. ==Death==