[1] After the deaths of the generals Nebiogastes and Iustinianus in 407, the Western usurper Constantine III appointed Edobichus and Gerontius as his magistri militum (commanders-in-chief of the army).
Upon their promotions, they forced Sarus, the general of the Western Emperor Honorius, to end his siege of Constantine in Valence and retreat into Italy.
[2] Meanwhile, Gerontius invaded southern Gaul, found Constantine at Arles, and laid siege to the city until the Imperial general Constantius arrived on the scene and forced him to retreat.
Despite being besieged now by Constantius, Constantine continued to hold Arles, having heard that Edobichus was nearby with the barbarian troops.
[3] Edobichus' death convinced Constantine to end his resistance, and the usurper took priestly vows before surrendering to the general Constantius.