The Ecclesiastical History of Sozomen

Although the city of Arles was closely besieged by the army of Honorius, Constantine still resisted the siege, because Edovicus was announced as at hand with many allies. This frightened the generals of Honorius beyond measure. Then they determined to return to Italy, and to carry on the war there. When they had united on this plan, Edovicus was announced as in the neighborhood, so they crossed the river Rhone. Constantius, who commanded the infantry, quietly awaited the approach of the enemy, while Ulphilas, the fellow-general of Constantius, remained not far off in ambush with his cavalry. The enemy passed by the army of Ulphilas, and were about to engage with the troops of Constantius, when a signal was given, and Ulphilas suddenly appeared and assaulted the enemy from the rear. Their flight was immediate. Some escaped, some were slain, while others threw down their arms and asked for pardon, and were spared. Edovicus mounted his horse and fled to the lands of one Ecdicius, a landed proprietor, to whom he had formerly rendered some important service, and whom he therefore imagined to be his friend. Ecdicius, however, struck off his head, and presented it to the generals of Honorius, in hope of receiving some great reward and honor. Constantius, on receiving the head, proclaimed that the public thanks were due to Ecdicius for the deed of Ulphilas; but when Ecdicius was eager to accompany him he commanded him to depart, for he did not consider the companionship of a malicious host to be good for himself or the army. And the man who had dared to commit the most unholy murder of a friend and a guest who was in an unfortunate situation,—this man went away, as the proverb says, gaping with emptiness.