AD364-378 Valens Silver Siliqua, Fine Plus

When his older brother Valentinian I was named emperor, he appointed Valens co-emperor, responsible for the eastern portion of the Roman Empire, a major step in the eventual complete separation of east and west. Valens successfully defended the eastern provinces until Germans, who had been allowed to settle in Roman territory, rebelled and defeated his army. Valens was apparently killed, though his body was never found.