The 1st phase of the sanctuary from the 1st half of the 2nd century BC consisted of a temple of Jupiter on a podium in the centre of a square
piazza. The temple had 4 frontal columns (
tetrastyle). The visible part of the roof was decorated with painted architectural terracottas while the pediment had a group of terracotta statues narrating a story dominated by Jupiter. The piazza was fronted by a portico with two colonnades, the outer one of the Doric order facing into the piazza and an inner central Ionic one dividing the portico into two aisles. The back wall also acted as terracing for the slope behind. Soon after the middle of the 2nd century BC, the sanctuary was redeveloped, possibly following a partial collapse after an earthquake, in the style of Hellenistic sanctuaries elsewhere in the Mediterranean. The eastern portico was added with a series of shops, indicating that the sanctuary was commercial as well as religious. The temple was rebuilt on a podium which used architectural decorations of the previous building as a form of ritual. Many inscriptions of
Iovei Sacrum (sacred Jupiter) scratched on black glazed cups and seals identified the deity of the temple, together with architectural elements decorated with lightning, a typical symbol of Jupiter. At the end of the 2nd c. BC a second
sacellum (small temple), dedicated to
Hercules, was built in the northern corner of the piazza. In the first century BC two rooms were added to the sides of the main portico each including three Ionic columns. ==Excavations==