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Papal basilicas is considered the Church of Rome. The popes lived in the Lateran palace until the beginning of the 14th century. The tour continues with a visit to the Basilica of San Clemente, the only church in Rome built on 3 different levels. Built from the 1st to the 12th century, it is possible to explore 2 of the 3 underground floors of the catacombs of Rome, including the 1st century altar of Mithras.
Continue to the church of the four crowned saints, dedicated to four anonymous saints and martyrs. In 2002, an extraordinary series of frescoes was discovered with scenes from the Zodiac, Four Seasons, Liberal Arts and King Solomon. Follow the story of Emperor Constantine and Pope Sylvester in the Chapel of San Silvestro, where the famous Constitutum Constantini (Donation of Constantine) was said to have taken place.
To complete the visit to the church of San Martino ai Monti, located in via Monte Oppio, it was founded by Pope Silvestro I on the land that had been granted to him by the priest Equizio, initially it was a large oratory in honor of all unknown martyrs, called " titulus Equitii "in memory of the donation and still visible in the church basement.