Tomás Ó Cellaigh
Tomás Ó Cellaigh was a Catholic Bishop of Clonfert. His death is recorded as 6 January 1263.
O Cellaigh was elected to that position sometime prior to 7 November 1259, as he received possession of temporalities commencing on that date.
His name is also recorded as Tomás mac Domnaill Móir Ó Cellaig. He was probably from Ui Maine.