![Photograph: Courtesy the Osservatore Romano](https://media.timeout.com/images/100645579/750/562/image.jpg)
4th-century portrait of Saint Peter from catacombs of St. Tecla, Rome
Francis I is the latest in a long line stretching back to Saint Peter, who, according to the Catholic Church, was the first pope. This is one of the earliest-known images of the apostle, to whom Jesus is believed to have entrusted the keys to the Kingdom of Heaven.
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