
The Temple of Hercules the Invincible is the only surviving structure from ancient Rome built entirely of Greek marble. It is located on the eastern bank of the Tiber River, in the ancient forum of Rome - Boarium. The temple is believed to be the work of the Greek architect Hermodoros of Salamis. The temple has a circular shape and is formed by 20 Corinthian columns that surround the central cylindrical stone block. The building became associated with Christianity in 1140, when Innocent III converted it into a church dedicated to San Stefano. The narrow columns are finished with perfect Corinthian carvings depicting acanthus leaves and carved stems, creating a contrast between shadow and light.