A more thorough explanation:

FIRMARIUS

Firmarius is a legal term in Latin that refers to a person who has the right to collect rent or profits from a property.

One example of a firmarius is a landlord who collects rent from tenants who live in a building that they own. Another example is a farmer who collects profits from crops grown on land that they lease from someone else.

These examples illustrate the definition of firmarius because they both involve a person who has the legal right to collect income from a property that they do not own outright. In both cases, the firmarius has a contractual agreement with the owner of the property that allows them to collect rent or profits in exchange for their use of the land or building.