Mathghamhain or Mahon Progenitor of Clan MacMahon

The MacMahons and the O?Carrolls were of the Clan Nadsluaig. Clan Nadsluaig descended from Fergus, son of Nadsluag, grandson of Eochaid. The Lords of Fernmaig were of this line, including Mathgamna, from whom came the name MacMahon. From the line of Mathgamna come both the families of O?Carroll, known as the Kings of Oriel at the height of its power just prior to the coming of the Normans, and the MacMahons, the latter descending from Niall, brother of Murrough O?Carroll the last O?Carroll King of Oriel.

• http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=ancestors...