Constantine, the first Christian Emperor, bequeathed war against Persia to his son Constantius, a legacy which haunted the next two decades, culminating in Julian′s debacle in 363. Much has been written on the timing, motives, and strategy of these campaigns but the same role model appears at their beginning and end: Alexander the Great. Here, I wish to re-examine the evidence for his presence: recent scholarship has minimized it at one end and maximized at the other.