Basilica of Santa Maria in Cosmedin
The Basilica of Santa Maria in Cosmedin is the result of the enlargement under Pope Hadrian I (772-790) of an ancient Christian place of worship attested since the 6th century. It also underwent a major renovation in 1123, making it one of the few examples of 12th-century sacred architecture in Rome. It is known to house the Bocca Della Verità. The 8th-century crypt has a rectangular plan, with a flat ceiling, and a tripartite hall with naves of four bays each with Corinthian columns. A peculiarity of this crypt is the transept, one of the rare cases of reintroduction of this element, typically Constantinian, into Carolingian architecture.