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Wiki information Riagail:
Riagail, aka Regulus, Irish monk, fl. 573-600. Riagail was an Irish monk expelled from Ireland with Columba.
Riagail of Bangor, aka Reghuil, Abbot of Bangor, died 881. Canon O'Hanlon says of him St. Reghuil, Abbot of Bangor, County of Down. - At the 11th of June, the Martyrology of Tallagh records a festival, in honour of Riagail, Bennchair. He flourished...