54 St. Leo's heroic efforts to safeguard the authority of the Church of Rome were not in vain. It was principally due to his personal prestige that "the citadel of the apostolic rock" was extolled and venerated not only by the Western bishops who took part in the councils held at Rome, but by more than five hundred Eastern bishops assembled at Chalcedon,(48) and even by the Byzantine emperors.(49)
Source: Aeterna Dei Sapientia (Vatican.va)