2-466: Mahoney is an Irish surname originally designating the descendants of Mathghamhain . In the early 16th century, during the collapse of the O'Mahonys , three new breakaway dynastic families formed: MacMahon, Mahon and Mahoney (the latter bearing an earldom. Extinct c. 1815). Mathghamhain Mathghamhain mac Cian was an Eóganacht Raithlind nobleman and maternal grandson of Brian Boru . He
4-727: Was the son of Cian mac Máelmuaid and his wife Sadhbh, who was a daughter of the High King Brian Boru . He died at the Battle of Clontarf in 1014 fighting for the High King . Mathghamhain's descendants eventually became sovereigns over territory in west Cork , notably around the Iveragh Peninsula and the town of Bandon . Today, his descendants use the surname O'Mahony , O'Mahoney, Mahoney , Mahony , Maughon or Mahaney This Irish biographical article
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