Seoán Ó Leaáin, Bishop of Clonfert, 1322–1336.
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.
This article about a bishop of the Middle Ages is a stub.