Pope Zosimus was the bishop of Rome from 18 March 417 to his death on 26 December 418. He was born in Mesoraca, Calabria. Zosimus took a decided part in the protracted dispute in Gaul as to the jurisdiction of the See of Arles over that of Vienne, giving energetic decisions in favour of the former, but without settling the controversy. His fractious temper coloured all the controversies in which he took part, in Gaul, Africa and Italy, including Rome, where at his death the clergy were very much divided.
Side entrance to San Clemente al Laterano, which is largely the same as it was when Zosimus and Caelestius met there in AD 418.
Pope Leo I, also known as Leo the Great, or Leo the Apostolic, was Bishop of Rome from 29 September 440 until his death.
Miniature which depicts Leo I, contained in the Menologion of Basil II (c. 1000 AD, Vatican Library)
Priest celebrating Mass at the Altar of Leo the Great with the Fuga d'Attila relief by Alessandro Algardi in St. Peter's Basilica
Sermones
Raphael's The Meeting between Leo the Great and Attila depicts Leo, escorted by Saint Peter and Saint Paul, meeting with the Hun king outside Rome