A more thorough explanation:

Definition: In Roman law, an argentarius was a moneylender or a banker.

Example: During the Roman Empire, argentarii were responsible for providing loans to individuals and businesses. They also acted as financial intermediaries, accepting deposits and making investments on behalf of their clients.

Explanation: The example illustrates how an argentarius was a key figure in the Roman economy, providing access to credit and financial services to those who needed it. They played a crucial role in facilitating trade and commerce, and their services were in high demand. The term argentarius is still used today in some contexts to refer to a banker or financial institution.