THE BEGINNINGS OF THE FLYNNS
Once upon a time, there was a tribe of Gaels descended from CONN THE HUNDRED-FIGHTER and so known as the Connachta. The Connachta grew fruitful and multiplied and divided into the Ui Briuin, Ui Fiachrach, and other tribes; and the Ui Briuin subsequently split into the Ui Briuin Ai on the plain of Mag nAi, the Ui Briuin Breifne (O Rourke, O Reilly, etc.) and the Ui Briuin Seola (O Flaherty, etc.). The Ui Briuin Ai, in turn, diversified into the Sil Maelruain (O Flynn, etc.), the Sil Muiredaigh (McGeraghty, O Connor, etc.) and the Sil Cathail (O Flannigan, etc.)
AD 554. CURNAN, the son of Aedh Abraidh, 8th Christian king of Connacht, went to St. Columcille for protection from the High King, Dermot son of Cearbhail; but Dermot's soldiers ignored the guarantee of sanctuary and forcibly took Curnan from Columcille and killed him, "which was the cause of the Battle of Cul-Dreimhne." Columcille went to his relatives, the O Neill of the North, who allied with the king of Connaught to defeat the High King. It is from Curnan that the O'Flynns trace their descent.
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