In Roman times there were three temples in what is now the area surrounding the basilica and former convent buildings: the Minervium, built by Gnaeus Pompey in honour of the goddess Minerva about 50 BC, referred to as '; the Iseum dedicated to Isis, and the Serapeum dedicated to Serapis. Details of the temple to Minerva are not known but recent investigations indicate that a small round Minervium once stood a little further to the east on the Piazza of the Collegio Romano. In 1665 an Egyptian obelisk was found, buried in the garden of the Dominican cloister adjacent to the church. Several other small obelisks were found at different times near the church, known as the ', which were probably brought to Rome during the 1st century and grouped in pairs, with others, at the entrances of the temple of Isis. There are other Roman survivals in the crypt.