Pope Sixtus III

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 in the city of Rome. His feast day is celebrated by the Catholic Church and Eastern Orthodox Church on 28 March.

Source: Wikipedia — https://en.wikipedia.org/wiki/Pope_Sixtus_III