In Roman law the an instrument used to secure a loan was called a fiducia,which means:

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The word fiducia comes from the Latin word "fidere" which means "to trust." In Roman law, fiducia was a legal mechanism used to secure a loan, where the borrower would transfer ownership of a property to the lender as security. If the borrower defaulted on the loan, the lender would become the new owner of the property. This mechanism was based on the trust that the borrower placed in the lender to return the property once the loan was repaid.

In Roman Law the an Instrument Used to Secure a Loan