Abstract Of the many accounts of Battle Milvian Bridge in a.d. 312 written soon after conflict, only those Eusebius Caesarea have Maxentius cross Tiber on a bridge boats to face forces Constantine. This detail, it is here argued, suggests that may be seen as latter-day Xerxes, Persian emperor who, preparation for his invasion Greece 480 b.c. , famously spanned Hellespont with pair boat-bridges....