The hall was Christianized and dedicated to Sancti Cosma et Damiano in 527, when Theodoric the Great, king of the Ostrogoths, and his daughter Amalasuntha donated the library of the Forum of Peace (Bibliotheca Pacis) and a portion of the Temple of Romulus to Pope Felix IV. The pope united the two buildings to create a basilica devoted to two Greek brothers and saints, Cosmas and Damian. The adjacent convent is a 17th century building.