With the Hasdingi portion of the Vandals he established the Kingdom in the Roman province of Gallaecia (north-western Iberia).
In 420 Comes Hispaniarum attacked the Vandals who had gone to war with the Sueves in Galicia where the tribes were confined after the Visigoths had severely defeated them in 418.
The imperial vicar (head of a diocese) defeated Maximus, son of earlier usurper Gerontius (409), in 420–421, but it resulted in the Vandals moving south to Baetica.
Conflicts with the Suebi drove him into Baetica in the south of Hispania, where he joined the surviving Silingi portion of the Vandals.
[1] Hydatius writes that in 428 Gunderic laid "hands on the church of that very city, by the will of God he was seized by a demon and died."