The temple was rebuilt in 42 B.C.E. and again after 283 C.E. Another early Republican temple is the Temple of the Castors (a.k.a. Temple of Castor and Pollux) that was completed in 484 B.C.E. and was dedicated to the Gemini who had aided the Romans at the Battle of Lake Regillus in 496 B.C.E. The temple had several construction phases. The Sacra Via passed along the forum square en route to the Capitoline Hill and the temple of Jupiter Optimus Maximus. This sacred route was used for certain state-level ceremonies, especially the celebration of the victory ritual known as the Roman triumph.
Two other early, sacred buildings are important to note. These are the Regia or "king’s house" and the Temple of Vesta, both located on the downward slope of the Palatine Hill near the point where it reaches the edge of the Forum Romanum proper. Both of these sacred buildings are quite ancient and had many building phases, making it difficult to refine the chronology of the earliest phases. The Regia served as a ceremonial home for the king—later passing into the ownership of the pontifex maximus (principal state-level priesthood) once the kings had been expelled—and consisted of an irregularly planned suite of rooms surrounding a courtyard. The sixth century B.C.E. phase was decorated with painted plaques of architectural terracotta, clearly indicating both elite function and investment. Across the way was the Temple of Vesta, focused on the maternal elements of the archaic state as well as safeguarding the cult of Vesta and the sacred, eternal hearth flame of the Roman people. Both the Regia and the Temple of Vesta developed from crude structures in earlier phases to stone-built architecture in later phases. The Severan family carried out the final significant restoration of the Temple of Vesta in 191 C.E.