the marriage of helena and julian took place days after his proclamation. the marriage confirmed the alliance of julian to her brother. according to ammianus marcellinus:"this happened on the sixth of november of the year when arbetio and lollianus were consuls. then, within a few days, helena, the maiden sister of constantius, was joined in the bonds of wedlock to the caesar." zosimus reports: "constantius declared him caesar, gave him in marriage his sister helena, and sent him beyond the alps. but being naturally distrustful, he could not believe that julian would be faithful to him, and therefore sent along with him marcellus and sallustius, to whom, and not to caesar, he committed the entire administration of that government."eutropius narrates: "constantius then remained sole ruler and emperor over the roman dominions. he then sent into gaul, with the authority of caesar, his cousin julian, the brother of gallus, giving him his sister in marriage, at a time when the barbarians had stormed many towns and were besieging others, when there was everywhere direful devastation, and when the roman empire was tottering in evident distress." according to socrates of constantinople: "the emperor recalled him [julian], and after created him caesar; in addition to this, uniting him in marriage to his own sister helen, he sent him against the barbarians. for the barbarians whom the emperor constantius had engaged as auxiliary forces against the tyrant magnentius, having proved of no use against the usurper, were beginning to pillage the roman cities. and inasmuch as he [julian] was young he [constantius] ordered him to undertake nothing without consulting the other military chiefs."