''Feictear Giolla Comáin issna nothannála knownach toní besna attestedginealaigh. intheBhí genealogies,sé norina isrí theresa any other reference to him or his father, Niall. He was king inbhliain 991 butach wasi atmbun warcogaidh withle [[Cú Ceanainn mac Taidhg|Cú Ceanainn]],amac son[[Tadhg ofUí his predecessorDhiarmada|Taidhg]]. TheThit warsiad endedle withchéile<ref>[[Annála theirna mutualgCeithre deathsMáistrí]], andACM another991.5</ref> memberagus ofrinneadh therí Uí Dhiarmada,de [[Muirghius mac Aodha|M|uirghius mac Aodha]],.<ref>ACM became king999.5</ref> '' Giolla Comáin left no known descendants, andagus aftertar éis na bliana 999, all subsequent Uí Dhiarmada kings descendended from Cú Ceanainn.