Pope Hilarius was the bishop of Rome from AD 461 to 468.
Pope Hilarius in the Nuremberg Chronicles.
Portrait of Hilarius from a church in Piacenza
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