Gilla in Choimded Ó Cerbailláin (died 1279), also known in Latin as Germanus,G Catholic was a medieval Irish bishop.'Raphoe and Derry in the 12th and 13th Centuries' Gwynn, A pp84-100: 'Donegal Annual' IV no.2 (1959)
Ó Cerbailláin was elected Bishop of Cinél nEógain in 1230. In 1254 he transferred the See from Ráith Lúraig (Maghera) to Derry.
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