Chiesa di San Salvatore in Onda

The Church of Saints John the Evangelist and Petronius dates mainly from the 16th century when the architect Ottaviano Mascherino rebuilt the church that had been dedicated in 1582 to the patron saints of the city of Bologna. The façade is a later work from the 17th century.

Santa Maria dell'Orazione e Morte was built in the 1730's. The Confraternità dell'Orazione e Morte (Confraternity of Prayer and Death) aims to bury anonymous corpses and pray for their salvation. In 1572 the Brotherhood acquired an area between Palazzo Farnese and the banks of the Tiber and built a small church with burial rights between 1575 and 1576. In 1732, the architect Ferdinando Fuga began to build the church that exists today, an oratory and a large cemetery, partly underground and partly on the river bank.

The Basilica of S. Maria in Trastevere, is supposedly the first official place of Christian worship built in Rome and certainly the first dedicated to the cult of the Virgin. According to the legend, the church was built in 340 on the oratory founded by Pope Callixtus I in the 3rd century, when Christianity had not yet spread.