21. The two emperors were scarcely settled on the throne, when the empire was attacked on every side, from the barbarous nations by which it was surrounded. The Cat'ti invaded Germany and Rhoe'tia, ravaging all with fire and sword; but were repelled by Victori'nus. The Britons likewise revolted, but were repressed by Capur'nius. 22. But the Parthians, under their king Volog'esus, made an irruption still more dreadful than either of the former; destroying the Roman legions in Arme'nia; then entering Syria, they drove out the Roman governor, and filled the whole country with terror and confusion. To repel this barbarous eruption, Ve'rus went in person, being accompanied by Aure'lius part of the way. 23. Ve'rus, however, proceeded no farther than An'tioch, and there gave an indulgence to every appetite, rioting in excesses unknown even to the voluptuous Greeks; leaving all the glory of the field to his lieutenants, who were sent to repress the enemy. 24. These, however, fought with great success; for in the four years that the war lasted, the Romans entered far into the Parthian country, and entirely subdued it; but upon their return their army was wasted to less than half its original number by pestilence and famine. 25. This, however, was no impediment to the vanity of Ve'rus, who resolved to enjoy the honours of a triumph, so hardly earned by others. Having appointed a king over the Arme'nians, and finding the Parthians entirely subdued, he assumed the titles of Arme'nius and Parthi'cus; and on his return to Rome, he partook of a triumph with Aure'lius, which was solemnized with great pomp and splendour.