Nicol Ó Duibhghiolla was Bishop of Kilmacduagh in 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.
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