Cormac MacDermott
Cormac MacDermot', King of Moylurg, reigned 1218-1244.
A great-great-great grandson of Cormac, Dermot Ruadh MacDermot, was ancestor of the MacDermot Roe sept of the family.
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Wikipedia
Cormac MacDermot', King of Moylurg, reigned 1218-1244.
A great-great-great grandson of Cormac, Dermot Ruadh MacDermot, was ancestor of the MacDermot Roe sept of the family.