Roman Emperor in the East, born Thrace, c.390;died 457. Under Ardaburius and Aspar he distingnished himself in the Persian and Hun campaigns. In 450 he married Empress Pulcheria and was crowned by the Patriarch of Constantinople, the first instance of the Christian ceremony of coronation. His policy of moderation especially in taxation rendered his reign prosperous and happy. The chief religious event following his coronation was the Council of Chalcedon, which he assembled with the cooperation of Leo I to deal with Monophysitism. He is venerated as a saint by the Orthodox Church on February 17,.