Cassius, son of Valens, was unfortunate enough to be in charge when Rome faced its next greatest crisis, the Viking Hordes. Although it is true that they'd been attacking the Empire's coasts for some time now, Cassius was the one who saw both the problem's climax and its end. He was regarded by later historians as a simple and incompetent leader, unready for his position as emperor. His appeasement of the Vikings has most recently been regarded as one of the Top 10 worst decisions made by an Emperor.