Gilla Mo Choinni Ua Cathail (died 1147) was King of Uí Fiachrach Aidhne.
Gilla Mo Choinni was the only member of the Ó Cathail sept to rule Aidhne.
They were rulers of Cenél Áeda na hEchtge until expelled by their Ó Seachnasaigh cousins in the 13th century.
Thereafter they settled in north County Galway and fell into obscurity.
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