The Temple of Saturn (Aedes Saturnus) also called Tempio della Concordia, is the oldest temple in the Forum Romanum, consecrated for the first time in c. 498 b.C. It is located in the west end of the Forum. There were three temples dedicated to Saturn on this location. The eight surviving columns of red and grey granite are from the third temple as reconstructed on 42 b.C. under Diocletian after a fire destroyed the second temple.
It was originally used to house the “Aerarium” or the treasury of Rome. The fact that the columns show significant differences is an indication that in the reconstruction of this temple, they made use of materials coming from other ruined temples.