| Gallagher Ó Gallchobhair | |
|---|---|
 | |
| Parent house | Northern Uí Néill |
| Country | Kingdom of Tyrconnell |
| Founder | Gallchobhar mac Rorcain |
| Titles |
|
| Cadet branches | Cannon O'Muldorey |
The Gallagher (Irish: Ó Gallchobhair) family of County Donegal, formerly one of the leading clans of Cenél Conaill, and therefore of all Ulster, originated in the 10th century as a derivative of their progenitor Gallchobhar mac Rorcain, senior-most descendant of Conall Gulban, son of Niall Mór Noigíallach (Niall of the Nine Hostages).[1][2][3] The O'Gallaghers held the High Kingship of Ireland during the early medieval period.[1] They also held the rank of hereditary Marshal of the Kingdom of Tyrconnell, ruled by their kinsmen the O'Donnells, from the 14th until the early 17th century.[4]
- ^ a b Gray, Iain (2016). Gallagher: The origins of the family name of Gallagher and their place in history. Lang Syne.
- ^ A Y-Chromosome Signature of Hegemony in Gaelic Ireland. Laoise T. Moore
- ^ O'Donovan (1858). The Annals of Ireland (2nd ed.). Dublin.
- ^ Woulfe, Patrick (1923). "Ó Gallchobhair - Irish Names and Surnames". www.libraryireland.com. Retrieved 12 August 2023.