Brión (or Brían), son of Eochaid Mugmedón, was a legendary and possibly historical Irish king, fl.
[2] Brión's descendants, the Uí Briúin, gave rise to many Kings of Connacht and its ruling families over the next thousand years.
According to this saga, Brión was the favorite son of his mother Mongfind, sister of Crimthann mac Fidaig (d. 367), the king of Munster.
However, Fiachrae's son Nath Í rallied forces and defeated Brión who was slain at a second Battle of Damchluain.
[3] According to Tirechan, Patrick visited the "halls of the sons of Brión" at Duma Selchae in Mag nAí, but does not give their names.