A disease strikes the Huns. The uneducated Mongol tribes have no idea how it is spread, and most die, along with their crops. The remnants of the Huns flee into Europe but are too insignificant to cause a major upset in the eastern tribes. The Roman Empire grows under Diocletian’s rule, and they take back the land lost during the Severan Dynasty. Constantine never comes into power, and Christianity never takes hold in the empire.