The crypt of the Popes
It is the most important and venerated crypt of the cemetery, called "the little Vatican" as it was the official burial place of nine popes and, probably, of eight dignitaries of Rome's 3rd century Church. In the walls you can still see the original inscriptions, in Greek, of five popes. On four tombstones, near the name of the pope, there is the title of "bishop", since the Pope was regarded as the head of the Church of Rome, and on two of them there is the Greek abbreviation of MPT for "Martyr".
Here are the names of the five popes: Pontianus, Antherus, Fabian, Lucius and Eutichian. In the front wall was laid to rest Pope Sixtus II, a victim of emperor Valerian's persecution.