Among the temples built was one dedicated to Diana by Manius Acilius Glabrio in 191 BCE, later demolished to make way for the Theatre of Marcellus, completed under Augustus around 15 BCE. The remaining three temples were incorporated into the Basilica of San Nicola in Carcere during the Middle Ages, first mentioned in the 11th century CE. The temples' unaligned architectural elements reflect the lack of standardized town-planning during the Republican era, and their construction further diminished the already crowded vegetable market that stretched to the Tiber River.

circa 750 BCE

The "sacred area" of the Foro Olitorio was located (identify) at the northern end of the Forum Holitorium. During the Republican period this area, although quite crowded, did not have the later monumental structures yet.

circa 260 BCE

Temple of Janus in the Forum Holitorium
The Temple of Janus was the one located on the right and the closest to the Theatre of Marcellus. Built by Gaius Duilius at the time of the First Punic War, it was restored in 17 CE by Tiberius.

It was a peripteros temple sine postìcum (with columns on three sides), with eight tuff (peperino) columns on the long sides and six on the front (hexastyle), covered with stucco and raised on a low podium with elegant shaping.

circa 258-249 BCE

Temple of Spes
The Temple of Spes (Latin: Aedes Spei) was located on the left, in opposition to the Temple of Janus. It was built by Aulus Atilius Calatinus, at the time of the First Punic War as well; it was restored in 232 BCE and rebuilt after the fire of 213 BCE, which also destroyed the temples of Sant'Omobono Area; finally it was restored in 17 CE by Germanicus Julius Caesar.

It was a peripteros doric temple with six columns on the front and eleven on the long side; the columns were made of raw travertine and covered with stucco to simulate the appearance of marble. It measured 25 metres (82 ft) in length and 11 metres (36 feet) in width. Six columns of the temple with their architrave still exist, incorporated in the left side of the church of San Nicola.

circa 194 BCE

Temple of Juno Sospita
The temple of Juno Sospita was located between the temple of Spes and that of Janus: on its ruins, towards the end of the 11th century, the current church was founded.

Built around 195 BCE by Gaius Cornelius Cethegus, it was a peripteros ionic temple, with six columns on the facade, three rows of columns on the front side and two on the back side. A travertine staircase, the same which is still used today to access the church, led to the pronaos of the temple. It was the largest of the three, since it measured 30 metres (98 feet) in length and 15 metres (49 feet) in width, as well as the tallest one, as can be seen by comparing the preserved columns of each of the temples. The present structure is due to the restoration commissioned by a certain Caecilia Metella in 90 BCE.

The remains of the temple are the basement, which can be visited inside the church, and three columns incorporated into the facade, one of which has no capital; these columns were still visible in their original state before the facade was rebuilt. Other remains, such as some columns, are visible inside the church.

circa 181 BCE

Temple of Pietas
The Temple of Piety (Aedes Pietatis) was a Roman temple dedicated to the goddess Pietas, a deified personification of piety. It was erected in 181 BCE at the northern end of the Forum Olitorium, the Roman vegetable market, and demolished in 44 BCE to make room for the building eventually known as the Theater of Marcellus. It seems to have been rebuilt and its services continued well into the imperial period, although this is disputed by some scholars.