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The activities of Roman banks are not documented in such detail as, for example, Greek ones, because no important Latin positions have been preserved. From Roman law, however, we know that banking and cash deposit were highly developed. Roman bankers appeared in the 3rd century BCE Initially, they were called trapezitai from the Greek (from the word trapezoid, meaning “abacus”), but then the Latin name argentarii came into use.
A turning point in Rome’s opening up to the great Mediterranean trade and, consequently, the development of credit and banking, was the opening of the port of Ostia in 179 BCE In Rome, the highest social groups performed the function of bankers since the conduct of banking activities was not contempt. At first, they were ordinary senators and their families. However, with the release of the law lex Claudia de senatoribus of 218 BCE which forbade senators and their sons to engage in trade and money transactions, this privilege fell on equites who had a wide earning potential. Later it happened that equites exceeded the senators in wealth and thus achieved high positions in the state.
The equites were in the hands of particularly profitable government offices, from which recruited publicani – officials responsible for collecting taxes in the provinces. Publicani often pooled their capital into companies (solitates).
Roman Senators, concerned about the rapid enrichment of equities and strengthening their influence, tried to limit their financial arbitrariness in the provinces. To this end, they introduced new laws designed to hinder the endeavours of the more agile social class.
Associations of Roman bankers
Bankers’ associations, or societates argentariae, were a banking peculiarity in the Roman world. The capital for their creation came from financial membership fees and was released to pay off debts. As banks were of particular public interest, Roman law required members of societates argentariae to be responsible for deposits with all their property. The joint, unlimited liability of the members of the associations was a general principle of Roman law, which served to minimize the effects of fraud and abuse by bankers and to protect the right of depositors to recover money at any request.
Their books recorded crediting and debiting of customer accounts. The Roman bankers’ books were treated as evidence in court, so they had to be kept in accordance with editio rationum for the dating and management of accounts. The Mensa (the type of counter that originally dealt with exchanging money), much like today’s banking licenses, was portable.
As in Rome, it was the state that owned the premises where banking activities were carried out, and the right to operate (granted by the state) was in the process of being handed over. Such a transfer could include all taverna furniture and equipment, as well as financial assets and liabilities. The bankers also formed a guild to defend common interests and obtained important privileges from the emperors.
Originally, the banks were located in temples, in the basements of which funds were collected. Where exactly did you get the idea that these temples would be places to store money? This is due to the fact that this holy place was constantly visited by priests, and patrols passed under the building. In this way, wealthy Romans were sure that their money was well secured. Money was often placed in various temples to avoid losing funds in the event of a robbery or fire.
In temples, money was exchanged, placed or borrowed. Some also had mints where new coins were minted – incl. in the Temple of Juno Moneta.
Argentarii – Roman bankers
The gradual development of trade in the Mediterranean in the 3rd century BCE led to the formation of private bankers (argentarii also called a rgenteae mensae exercitores, argenti distractores or negotiatores stipis argentariae), who had business in taverns (taverna) in Forum, near the temple of Castor and Pollux2. In addition to argentarii, there were mensarii and nummularii, which will be discussed in the following subsections.
Bad business could end up in bankruptcy for the bankers. Bankruptcy was known as foro cedere, foro abire, or a foro fugare, meaning “fleeing the forum”. Such a strange combination of words resulted from the fact that the presence on the forum was the duty of a person doing business. In this way, he proved his solvency. Leaving the square led to the obvious thesis that the banker was running an unclear business.
Bankers accepted deposits, made loans, exchanged money (permutatio), and sometimes auctioned for a 1% commission. Permutatio was performed for a small fee (collybus). A specific operation was the contract presum argentarii, in which the banker guaranteed his client’s loan from a third party, becoming, in the event of the client’s insolvency, the debtor of the latter. With time, this operation was replaced by constitutum debiti alieni, i.e. an informal obligation to pay someone else’s debt. Such solutions allowed for the development of new credit operations.
Each banker was required to keep two kinds of books: adversarium and codex rationae mensae.
- Adversarium was a pop-up log where the locker logged operations in chronological order.
- Codex rationae mensae was a set of customer accounts broken down into debit (expensum ferre) and credit (acceptum ferre).
As previously mentioned, a citizen could apply for a loan. Roman law knew two types of loans:

