San Babila was once considered the third most important in the city after the Duomo and the Basilica di Sant'Ambrogio. It is dedicated to saint Babylas of Antioch.
At the beginning of the 5th century, Marolus, the bishop of Milan, brought from Antioch to Milan relics of saints Babylas of Antioch and Romanus of Caesarea. Marolus founded the Basilica Concilia Sanctorum or church of San Romano, which stood until the 19th century, a few meters south of the church of San Babila, on the site of a Roman temple dedicated to the Sun.
The church of San Babila was built on the same site in about 1095. In the 16th century, the church was extended with an additional construction at the front and a new baroque façade. The church still retains its original medieval fabric, although much was lost due to baroque and modern renovations.
The whole complex was renovated in the 19th century with the intent of restoring the appearance of the medieval basilica, and in the early 20th century the Neo-Romanesque façade by Paolo Cesa-Bianchi was built. The bell tower is from 1920, and replaced the original tower which fell down in the 16th century.
The interior has a nave and two aisles. There are two side chapels that date from the late Renaissance. The right aisle has an image of the Madonna which is highly venerated by the Milanese population.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.