According to
Dubhaltach Mac Fhirbhisigh (263.8), Dubhda was the younger brother but came to an arrangement with Caomhán in which Dubhda would become king, while ''"Caomhán's representative should have a choice of territory as his patrimony and (the right to be at) the shoulder of the king of Ui Fhiachrach always"'' and other rights besides. His grandson,
Aed Ua Dubhda (died 983) would become
King of
Ui Fiachrach Muaidhe. ==Family tree==