CONSTANTINE III (Flavius Claudius Constantinus)
Jovinus was a Gaulish noble and was proclaimed emperor at Mainz in 411 A.D. by Guntiarius,. king of the Burgundians, and Goar, king of the Alani.
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' end came after the Visigoths under Ataulf left Italy (at Priscus Attalus' advice), ostensibly to join him, carrying with them as hostages the ex-emperor Attalus and Galla Placidia, Honorius' half-sister. Ataulf then attacked and killed Sarus, who had also come to support Jovinus. Jovinus, in retaliation, elevated his brother Sebastianus as co-emperor without consulting Ataulf. Insulted, Ataulf allied his Visigoths with Honorius, and they defeated Jovinus' troops. Sebastianus was executed. 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. Jovinus' and Sebastianus' heads were afterwards sent to Honorius and mounted on the walls of Ravenna (before being passed on to Carthage, where they were put on permanent display with the heads of four other usurpers).