The Temple of Hercules Victor in Rome's former Forum Boarium is a round peripteral temple, or tholos, of Greek design. Its builder is disputed between L. Mummius Achaicus and the trader Marcus Octavius Herrenus. The article dates it to the later 2nd century BC, c. 143 to 132 BC, and names no architect.
The temple is 49 feet (14.8 m) in diameter, ringed by 20 Corinthian columns, each 35 feet (10.66 m) tall, on a tuff foundation. The article calls it the only surviving Roman building made of Greek marble, and ten columns were later replaced with Luna marble. Nineteen of the original 20 columns remain.
It became a church by 1132, and Innocent II dedicated it to Santo Stefano in 1140. It was later rededicated to Santa Maria del Sole. Ground level around it was lowered in 1809 and 1810, and it was restored in 1996. Palladio's dome reconstruction is considered erroneous.

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