O'Donnell (Irish: Ó Donaill or Ó Domhnaill), which is derived from the forename Domhnaill (meaning "world ruler", Rex Mundi in Latin, Modern Irish spelling, Dónall) were an ancient and powerful Irish family, kings, princes, and lords of Tír Chonaill (rendered in English as Tyrconnell or Tyrconnel, known today as County Donegal) in early times, and the chief allies and sometimes rivals of the O'Neills in Ulster. - Source: Wikipedia
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