Gallagher ancient lineage
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Lineage of the Cineál Connell, the Donegal clans, i.e., O’Cannon, O’Muldory, Mac Gilla Finnen, O’Gallagher, O’Doherty, O’Donnell, O’Boyle.
Pages 335-336 of The banquet of Dun na n-Gedh and The battle of Magh Rath by John O’Donavan (http://www.archive.org/details/banquetofdunnang00trin ) and page 98 of the same book re O’Donnell being inferior to O’Gallagher.