Basilica of Santo Stefano Rotondo al Celio

A first church was built here in antiquity, mentioned in the acts of the synod of Pope Simmaco in 499. Pope Paschal I (817-824) had the basilica rebuilt in 818-822, endowing it with mosaics. The appearance of the present church of Santa Maria in Domnica, however, owes much to a reconstruction in the 16th century, when the church was closely linked to the Medici family.

The Basilica of Saints John and Paul was first erected in 398. This original church was damaged during the sack of Rome (410), then by an earthquake in 442 and was finally sacked by the Normans in 1084. The building was continually remodelled from the 11th century onwards and the building had its present appearance in 1951 when Cardinal Franz Joseph Spellman had its early Christian façade restored.

The Basilica of San Sisto vecchio was first built in the 4th century and rebuilt at the beginning of the 13th century by order of Pope Innocent III (1198-1216). A fresco painted on this occasion and depicting scenes from the New Testament and apocrypha is preserved. The rest of the building, with the exception of the apse and the bell tower, was rebuilt in the 18th century by order of Pope Benedict XIII (1724-1730).