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Dermot mac Tadhg Mor, 7th king of Moylurg, reigned from 1124 to 1159. Vassal and kinsman of the O Conchobhair Kings of Connacht. Dermot was the progenitor of the MacDermot family, as well as its offshoot septs such as MacDermot Roe, McDonagh, and Crowley (surname).

Preceded byMaelsechlainn mac Tadhg Mor King of Moylurg 1124–1159 Succeeded byMuirgius mac Tadhg More

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