The troops of Constans were shortly afterwards strengthened by reinforcements, and Didymus and Verinian, with their wives, were taken prisoners, and were eventually put to death. Their brothers, Theodosiolus and Lagodius, who were living in other provinces, fled the country; the former escaped to Italy, to the Emperor Honorius; the latter fled to the East, to Theodosius. After these transactions, Constans returned to his father, after he had posted a guard of his own soldiers for the road to Spain; for he did not permit the Spaniards to act as guard, according to the ancient custom, a privilege for which they had petitioned. This precaution was probably afterwards the cause of the ruin of the country; for when Constantine was deprived of his power, the barbarous races of the Vandals, Suevi, and Alani took confidence and conquered the road, and took possession of many forts and cities in Spain and Gaul, and arrested the officers of the tyrant.
In the meantime, Constantine, who still thought that matters would go according to his purpose, caused his son to be proclaimed emperor instead of Cæsar, and determined to possess himself of Italy. With this view, he crossed the Cottian Alps, and entered Liverona, a city of Liguria. He was on the point of crossing the Po, when he was compelled to retrace his steps, upon being informed of the death of Alavicus. This Alavicus was the commander of the troops of Honorius, and being suspected of conspiring to place the entire Western government under the domination of Constantine, he was slain when returning from a procession, in which, according to custom, it was his office to march in advance of the emperor. Immediately after this occurrence, the emperor descended from horseback, and publicly returned thanks to God for having delivered him from one who had openly conspired against him. Constantine fled and seized Arles, and Constans, his son, hastened from Spain, and sought refuge in the same city.
On the decline of the power of Constantine, the Vandals, Suevi, and Alani eagerly took the Pyrenees when they heard that it was a prosperous and most abundant region. And since those who had been entrusted by Constans with the guard of the passage had neglected their duty, the invaders passed by into Spain.