Santi Quattro Coronati is an ancient basilica in Rome, Italy. The church dates back to the 4th century, and is devoted to four anonymous saints and martyrs.
Tradition holds the first church on the site was begun by Pope Miltiades, in the 4th century on the north side of the Coelian Hill. One of the first churches of Rome, it bore the Titulus Aemilianae from the name of the foundress, who probably owned the elaborate Roman villa, the structure of which is evident under the church. The church was completed by the end of the 6th century, and because of its proximity to the medieval papal residence of the Lateran Palace, it became prominent in its day. The first renovations occurred under Pope Leo IV (847–855), who built the crypt under the nave, added to side aisles, enclosed the courtyard before the facade, and built the belltower and the chapels of Saints Barbara and Nicholas. The new remarkable basilica, Carolingian architecture in style, was 95 m long and 50 m wide.
