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Cathal mac Ógán is an ancestor of the Ó Cathail–Cahill family of County Galway. Cathal was a member of the Uí Fiachrach Aidhne, and a thirteen-time great-grandson of Nath Í, King of Connacht. His grandchildren and great-grandchildren were the first to bear the surname Ó Cathail (i.e., ua Cathal, ''grandson/descendant of Cathal'') and until the 13th century would contest the kingship of Aidhne with the descendants of Seachnasach mac Donnchadh, Scannlán mac Fearghal, Eidhean mac Cléireach and Giolla Ceallaigh mac Comhaltan. While the family did provide a number of rulers of the area, ultimately Cathal's descendants were overthrown and suppressed by the descendants of Seachnasach mac Donnchadh, and remained a minor family until the end of Gaelic Ireland. Cahill is the name of a number of distinct families in Ireland, and not all are related. ==References== * ''The Surnames of Ireland'', Edward MacLysaght, Dublin, 1978. * ''Irish Kings and High Kings'', Francis John Byrne, 2001 (second edition). * ''The Great Book of Irish Genealogies, 257.9, pp. 586–87, volume one, Dubhaltach MacFhirbhisigh; edited, with translation and indices by Nollaig Ó Muraíle'', 2003–2004. ISBN 0 946130 36 1. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cathal mac Ógán」の詳細全文を読む スポンサード リンク
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