The temple might have been begun by Tarquin the Proud and inaugurated in 497 BC.
Rebuilt under Augustus, then again under Diocletian, it was built on
a high buttress of 5 meters. It housed the public treasure (ærarium).
One also used to deposit there the ensigns of the legions during
the time between the campaigns, as well as an official exemplary
of the laws. During the Empire, the old Treasure of Saturn became
simply the municipal fund of Rome.
still stand eight superb columns of the pronaos.