Whatever the historicity of Brión himself, the principal lineage of the dynastic group claiming descent from him, that of Uí Briúin Aí, produced the royal line of Ua Conchobair. Through his alleged son Duí Galach, whose death is placed at 502 and who is credited with having held the kingship of Connacht, Brión is claimed as ancestor by three separate lineages of Uí Briúin kings, occasioning a considerable degree of genealogical contrivance. Besides the ruling lines of Connacht, the obscure segment of Corco Tene and a line of Uí Dercu Chéin is also traced to Brión (Rawl. B 502, 154a; LL 336a), which may reflect the absorption of these petty lordships by an expanding Uí Briúin dynasty at a later date. In addition, the genealogists represent Brión as the father of Feidelm Fholtchaín, wife of Domangort and mother of Gabrán and Comgall of the dynasty of Dál Riata (LL 336b 50).