Following his father's death, Cumee was made chief of his kindred by Henry de Mandeville, seneschal of Ulster, and thereupon served as an ally to this Anglo-Irish lord. His ties with the Normans earned him the epithet of na nGall meaning "of the foreigners".[3]
Cumee's son, Dermot, appears on record in 1312.[4] Cumee's daughter, Anna (Áine), married Angus Og MacDonald.[5]
A heavily restored effigy at Dungiven Priory is sometimes associated with Cumee, although it appears to date to the last quarter of the fifteenth century, and seems to be that of a later member of the kindred: perhaps either Godfrey (Gofraidh, died 1472), Dermot (Diarmait, died 1484), Godfrey (Gofraidh, died 1492), or Owen (Eóin, died 1492).[6]
Hamlin, A (2002). "Dungiven Priory and the Ó Catháin Family". In Ní Chatháin, P; Richter, M; Picard, Jean-Michel (eds.). Ogma: Essays in Celtic Studies in Honour of Próinséas Ní Chatháin. Dublin: Four Courts Press. pp. 118–137. ISBN1-85182-671-8.