Weis' "Ancestral Roots. . ." (170:3). the following is taken from an Internet posting of Michael R. Davidson of Edinburgh. Scotland, on 23 Oct 1995:
Domangart mac Fergus
Domangart succeeded to the kingship upon his father's death in 501. The _Senchus_ and other sources note that Feidelm Fotchain bore Domangart two sons. According to the genealogies, Feidelm was the daughter of Brian mac Eochaid Mugmedon, the ancestor of the kings of Airgialla, in the northern part of Ireland. Annals make no mention of Domangart excepting his death in 507, and he was succeeded by his son Comgall.