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Pope Leo I - Wikipedia
Leo I (emperor) - Wikipedia
Saint Leo I | Biography, Papacy, Legacy, & Facts | Britannica
Leo I | Byzantine, Eastern Roman, Reformer | Britannica
Leo I - World History Encyclopedia
Leo I - New World Encyclopedia
Leo I (emperor) - Hellenica World
Leo I - Christianity Today
CATHOLIC ENCYCLOPEDIA: Pope St. Leo I (The Great) - NEW ADVENT
Leo I (emperor) - Wikiwand