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The church of Santi Apostoli is also called locally "Vecchio Duomo di Firenze" because of its importance in the history of Florence. The building was built from the 11th century and is one of the oldest in Florence.

The date of construction of the Santi Apostoli dei Cristo is unknown but it is known that the building was completely rebuilt in 1021. It was almost completely rebuilt in 1105 after a fire that caused its complete ruin. In the 15th century, the architect Mauro Codussi added to the existing structure a portico on the side façade, the sacristy and the chapel of the Corner noble family. In 1575, the church was almost completely rebuilt: the load-bearing walls were reused and some of the 14th-century frescoes were preserved, as well as the Corner chapel. The architect Alessandro Vittoria was commissioned to carry out the work. The bell tower dates from 1672 but was completed by Andrea Tirali in the 18th century.

The church of Saints Charles and Agatha, commonly known as San Carlo, was radically rebuilt in the 1760s to a design by Luigi Bartolomeo Avanzini and under the direction of the local architect Girolamo Beltrami. Previously, the oratory had been dedicated to Saint Faustino since 857 and to Saint Agatha since 1549. It was only in 1639 when the oratory was acquired by the Confraternity of Saint Agatha, that the dedication to Saint Charles was added.

The church of Saints Celsus and Julian was founded in the 9th century and was made a papal chapel during the pontificate of Innocent III (1198-1216). The original church was demolished and rebuilt at the request of Pope Julius II (1503-1513), who asked Donato Bramante for a new project (1509). This project was not carried out due to lack of funds; two centuries later, Pope Clement XII (1730-1740) decided to have the church rebuilt according to the project of Carlo de Dominicis, completed in 1735.

The church of Santi Claudio e Andrea dei Borgognoni dates from the 17th century. The church was bequeathed to the Burgundians, who emigrated en masse to Rome at the beginning of the 17th century and established a confraternity here in 1652 near Piazza San Silvestro. The church was completely destroyed in 1726 and rebuilt to the plans of Antoine Derizet from June 1728, completed in 1730 and consecrated the following year. From 1866 onwards, it was granted to the Congregation of the Blessed Sacrament.

The Church of Saints Fabiano and Venanzio was built in 1936 by the architect Clemente Busiri Vici. The interior consists of a nave and two aisles; the presbytery is crowned by a mosaic covering the entire wall, representing Christ blessing with Saints Fabian and Venantius. In the church premises, there are works from the former church of Saints Venantius and Ansovino, demolished in 1928 for the construction of the Piazza di San Marco.

The church of Santi Francesco e Giustina was built between the end of the 13th and the beginning of the 14th century to meet the religious needs of the adjacent Franciscan monastery, which has now disappeared. The original building, of Gothic design, underwent important renovations which, after having been considerably enlarged, also changed the position of the facade, now in neoclassical style, which characterises its current appearance. The first body of the Church of St. Francis was built between 1297 and 1300 in the Gothic style, with a single nave, five apsidal chapels and a facade overlooking the present-day Via Silvestri. In 1413, the church was enlarged with a nave on the right side with five communicating chapels. The bell tower was built in 1520 and the central apse was further extended in 1533.

The collegiate church of Saints Gervasio and Protasio was built between 1628 and 1641 after the old building was damaged by Swiss troops in 1620 and destroyed by Spanish troops in 1621. The bell tower was restored in 1927.

The church of Saints Gervasius and Protasius is first mentioned in papal bulls of the 12th century, although the present building dates from the mid-19th century. The present church was built in neo-Gothic style by the architect-engineer Giovan Battista Meduna between 1852 and 1857, consecrated in 1858 (but not actually completed until 1912).

The Church of Saints John and Paul was built in the 15th century on the remains of an earlier sacred building with three apses that was consecrated in 1263. The church was completely remodelled between 1444 and 1467. The Romanesque building was enriched by covering the façade with white stone slabs, thus giving the building a Gothic-Venetian style.