Introduction to Santa Maria in Cosmedin: Santa Maria in Cosmedin is across the street from Cowherd Square. It is a Catholic secondary temple built in the sixth century AD and is famous for its famous "Mouth of Truth." The original site of the church was a temple and a food distribution center in ancient Rome. It has been renovated many times in history and has a beautiful architectural design. It has three naves and a porch. The bell tower of the church is the tallest medieval bell tower in Rome.