Pope Leo I
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Pope Leo I, also known as Leo the Great, was Bishop of Rome from 29 September 440 until his death on 10 November 461. He is the first of the three Popes listed in the Annuario Pontificio with the titl
Priest celebrating Mass at the Altar of Leo the Great with the Fuga d'Attila relief by Alessandro Algardi in St. Peter's Basilica
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fresco from Santa Maria Antiqua
Leo the Great in the Menologion of Basil II (11th century)
Pope Sixtus III
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Pope Saint Sixtus III, also called Xystus III, was the bishop of Rome from 31 July 432 to his death on 18 August 440. His ascension to the papacy is associated with a period of increased construction
Pope Leo I
…entirely clear whether the letter was intended for Leo in his capacity as archdeacon, or for Pope Celestine I directly. Near the end of the reign of Pope Sixtus III, Leo was dispatched at the will of Emperor Valentinian III to settle a dispute between Aëtius, one of the chief Roman military commanders in Gaul, and…
Mosaic from Santa Maria Maggiore (c. AD 435), with Sixtus III's name (Xystus Episcopus Plebi Dei, "Sixtus Bishop to the People of God.")