As emperor of Spain, Gaul, and Britain, Constantine proves his strength against his barbarian enemies. But when the other Roman emperors begin to turn on each other again, Constantine determines to put an end to such rivalries once and for all. Defeating emperor after emperor, Constantine slowly gains control of the entire Roman Empire and establishes a new capital in the east. Along the way, he has a vision that will change the course of western civilization forever. Fighting under the cross of the Christian God, Constantine not only legitimizes the young religion, but seeks to use it as a unifying force in the empire.