The intelligence of these important events, which so deeply affected the honor and safety of the Imperial house, recalled the arms of Constantius from the inglorious prosecution of the Persian war. He recommended the care of the East to his lieutenants, and afterwards to his cousin Gallus, whom he raised from a prison to a throne; and marched towards Europe, with a mind agitated by the conflict of hope and fear, of grief and indignation. On his arrival at Heraclea in Thrace, the emperor gave audience to the ambassadors of Magnentius and Vetranio. The first author of the conspiracy Marcellinus, who in some measure had bestowed the purple on his new master, boldly accepted this dangerous commission; and his three colleagues were selected from the illustrious personages of the state and army. These deputies were instructed to soothe the resentment, and to alarm the fears, of Constantius. They were empowered to offer him the friendship and alliance of the western princes, to cement their union by a double marriage; of Constantius with the daughter of Magnentius, and of Magnentius himself with the ambitious Constantina; and to acknowledge in the treaty the preëminence of rank, which might justly be claimed by the emperor of the East. Should pride and mistaken piety urge him to refuse these equitable conditions, the ambassadors were ordered to expatiate on the inevitable ruin which must attend his rashness, if he ventured to provoke the sovereigns of the West to exert their superior strength; and to employ against him that valor, those abilities, and those legions, to which the house of Constantine had been indebted for so many triumphs. Such propositions and such arguments appeared to deserve the most serious attention; the answer of Constantius was deferred till the next day; and as he had reflected on the importance of justifying a civil war in the opinion of the people, he thus addressed his council, who listened with real or affected credulity: “Last night,” said he, “after I retired to rest, the shade of the great Constantine, embracing the corpse of my murdered brother, rose before my eyes; his well-known voice awakened me to revenge, forbade me to despair of the republic, and assured me of the success and immortal glory which would crown the justice of my arms.” The authority of such a vision, or rather of the prince who alleged it, silenced every doubt, and excluded all negotiation. The ignominious terms of peace were rejected with disdain. One of the ambassadors of the tyrant was dismissed with the haughty answer of Constantius; his colleagues, as unworthy of the privileges of the law of nations, were put in irons; and the contending powers prepared to wage an implacable war. 75