Gallagher family
Gallagher family
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Gallagher family

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Gallagher family

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). The O'Gallaghers held the High Kingship of Ireland during the early medieval period. 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.

Conall Gulban, son of Niall Noígiallach, founded the kingdom of Tír Chonaill (Tyrconnell) in the 5th century. It comprises much of what is now County Donegal, and several surrounding areas. The following is a pruned and truncated version of the Conall Gulban family tree with Conall Gulban's brothers Eógan, to Lóegaire, also displayed. For clarity's sake the number of Conall Gulban's sons, grandsons and great-grandsons are not listed. Gallchobar is descended from Mael Coba brother of Domnall mac Áedo.

Genetic analysis of Gallagher Y chromosome haplogroups can trace back their origin to a single medieval, 5th-century individual, lending credence to the legend of Niall Noígiallach.

The prefix Mac means 'son of' and the now more popular Ua (later Ó') means 'grandson of, or, of the generations of'.

The O'Gallagher clan hails from the Irish baronies of Tír Aodha/Tír Hugh ("land of Hugh") and Raphoe, in the east of County Donegal, Ireland, in which Ballybeit and Ballynaglack served as seats of their power. They were anciently chiefs of Cenél Aedha (the descendants of Áed mac Ainmuireach) and of the larger Cenél Conaill.

One modern and therefore apocryphal origin story is that the original person, being a courageous and charitable person, went to the assistance of the crew of the first Viking ship to arrive off the Irish coast and whose ship was wrecked off the coast of County Donegal, where he was the local chieftain. He having first saved them and then cared for them, they eventually returned to their homeland, only to return soon after with the first raiding party. Hence it is argued he was given the name ("Gall" means stranger or foreigner in modern Irish and the ending "cubhair" and "cobhair" which for the purpose of this story is said to be derived from "cabhair" in modern Irish meaning help or helper). Whatever the derivation of his name (see reference to O' Clery's Glossary above giving the derivation as Gal+acobhar 'ambition of valour'), Gallchobhar was the one given the role of founding father of the clan at the advent of surname use in Ireland in around the 10th century. The earliest recorded incidence of the name in a fragment of a manuscript presently in the Royal Library of Brussels is "Gallchubhair". A similarly earlier mention occurs in the Annals of the Four Masters, where it is recorded that Mael Cobo Úi Gallchobhar, abbot of Scrin Adamnain, died in 1022 AD.

The family's origins are with the chieftain Aodh, a name corresponding to the English Hugh (whence Tirhugh), a lineal descendant of Conall Gulban son of 5th-century high king and warlord Niall Noígíallach, known in English as Niall of the Nine Hostages, who is reputed to have brought St Patrick to Ireland as a slave. Aodh established his dúnarus fort building or residence at a place corresponding to the present-day townland of Glassbolie[where?] in Tirhugh. The chieftains of his line ruled in relative peace[dubiousdiscuss] for several generations until the beginning of the Viking invasion of Ireland in the 9th century. The ruling chieftain of the time, whose real name is not recorded, was almost certainly obliged[dubiousdiscuss] to come to some accommodation with the foreign invader resulting in the nickname "Gallcóbhair" which has been applied to his descendants thereafter.[dubiousdiscuss]

It would appear that the previously obscure Cenél Lugdach forged multiple matrimonial alliances with the local Viking leadership, and not the Gallchobair of the Cenél Aedha who existed before the arrival of the Vikings in the 800s, the Cenél Lugdach are descended from Lugaid mac Sétnai, one of the great-grandsons of Conall Gulban. In contrast to the Gallchobair who are descended from his brother and the first born son Ainmuire mac Sétnai. The Cenél Lugdach tribal territory extended from Dobhar (Gweedore) to the river Suilidhe (Swilly) in Donegal. From this clan descend the Cenél Conaill surnames of O'Doherty, and O'Donnell.

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