Nicol Ó Duibhghiolla, Bishop of Kilmacduagh, 1419.
Nicol Ó Duibhghiolla was appointed bishop before October 1419, replacing the late Diamaid Ó Donnchadha (appointed about July 1418), but never consecrated. The see was instead held from 23 October 1419 by Seaán Ó Connmhaigh.
References
Nicol Ó Duibhghiolla Wikipedia(Text) CC BY-SA