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Basilica of SS. Cosmas and Damian
The Basilica of SS. Cosmas and Damian is a church in the Roman Forum, parts of which incorporate original Roman buildings. The circular building at the entrance onto the Forum (not used today) was built in the early 4th century as a Roman temple. The main building was perhaps the library of an imperial forum. It became a church in 527 and contains important but much-restored early Christian art, especially in its mosaics. Today it is one of the ancient churches called tituli, of which cardinals are patrons as cardinal-deacons.

© Anthony Majanlahti | Flickr CC by 2.0