Brig married Domnall Ilchelgach MAC MUIRCHERTACH rí Ailech, Ard-rí na h'Éireann, son of Muirchertach Mór MAC ERCAE rí Ailech, Ard-rí na h'Éireann and Duinseach ingen Duach UA BRIÚIN. (Domnall Ilchelgach MAC MUIRCHERTACH rí Ailech, Ard-rí na h'Éireann died in 561.)