Career
Previously Archdeacon of Tuam. He was elected 10 November 1319, but wasn"t appointed until 6 August 1322. Ó Leaáin was consecrated 20 September and received possession of temporalities 29 December 1322.
After his death on 7 April 1336, the see lay vacant for as many as ten years.
However, at some point prior to 14 October 1437, he was succeeded by a prince of the Ui Maine dynasty, Tomás mac Gilbert Ó Cellaigh.
