Jovinus kept his position in Gaul for two years, long enough to issue coinage that showed him wearing the imperial diadem.

Under the pretext of Jovinus' imperial authority, Gundahar and his Burgundians established themselves on the left bank of the Rhine (the Roman side) between the river Lauter and the Nahe.

Here they founded a kingdom with the old Romanized Gaulish settlement of Borbetomagus (Worms) as its capital.

Jovinus, offended at this act, then failed to consult Ataulf when he elevated his brother Sebastianus as co-emperor.

Jovinus fled for his life, but was besieged and captured in Valentia (Valence, Drôme) and taken to Narbo (Narbonne), where Caius Posthumus Dardanus, the praetorian prefect (governor) in Gaul, who had remained loyal to Honorius, had him executed.