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Ancient religious monument in Rome, Italy

The Temple of Hercules Victor or Hercules Olivarius (Latin for "Hercules the Olive Bearer") is a Roman temple in Piazza Bocca della Verità, the former Forum Boarium, in Rome, Italy. It is a tholos, a round temple of Greek 'peripteral' design completely surrounded by a colonnade. This layout caused it to be mistaken for a temple of Vesta until it was correctly identified by Napoleon's Prefect of Rome, Camille de Tournon. Despite (or perhaps due to) the Forum Boarium's role as the cattle market for ancient Rome, the Temple of Hercules is the subject of a folk belief claiming that neither flies nor dogs will enter the holy place. The temple is the earliest surviving mostly intact marble building in Rome and the only surviving one made of Greek marble.

Dating from the later 2nd century BC and erected by L. Mummius Achaicus, conqueror of the Achaeans and destroyer of Corinth, or by Marcus Octavius Herrenus, the temple is 14.8 m in diameter and consists of a circular cella within a concentric ring of twenty Corinthian columns 10.66 m tall, resting on a tuff foundation. These elements supported an architrave and roof, which have disappeared. The original wall of the cella, built of travertine and marble blocks, and nineteen of the originally twenty columns remain but the current tile roof was added later. Palladio's published reconstruction suggested a dome, though this was apparently erroneous. The temple is the earliest surviving marble building in Rome. The temple's original dedication is dated back to circa 143 132 BC, a time when intense construction was taking place in Portus Tiberinus.

Its major literary sources are two almost identical passages, one in Servius' commentary on the Aeneid (viii.363) and the other in Macrobius' Saturnalia. Though Servius mentions that aedes duae sunt, "there are two sacred temples", the earliest Roman calendars mention but one festival, on 13 August, to Hercules Victor and Hercules Invictus interchangeably.

In the 1st century AD, the temple was hit with some sort of disaster as 10 columns were replaced with Luna marble, which is similar to the original but not an exact replica. By 1132, the temple had been converted to a church, known as Santo Stefano alle Carozze (St. Stephen 'of the carriages'). In 1140, Innocent II converted the temple into a Christian church dedicating it to Santo Stefano. Additional restorations (and a fresco over the altar) were made in 1475. A plaque in the floor was dedicated by Sixtus IV. In the 12th century, the cella wall was replaced with brick faced concrete and windows were added as well. In the 17th century, the church was rededicated to Santa Maria del Sole ("St. Mary of the Sun"). The temple and the Temple of Vesta in Tivoli were an inspiration for Bramante's Tempietto and other High Renaissance churches of centralized plan. Between 1809 and 1810, the surrounding ground level was lowered and the temple was restored once again. The temple was recognized officially as an ancient monument in 1935 and restored in 1996.