Where did Romans store their money?

The state treasury was in the temple of Saturn which also housed public records. Individual Romans either kept their money at home locked up securely, or entrusted it to men called "argentarii". An argentarius was comparable to our present day banker. His responsibilities were to exchange foreign coins for Roman ones, to hold funds for clients, to pay interest for their clients and act as purchasing agents for them. During the late republic and principate, the argentarii were responsible for the circulation of newly minted coins.