What "always was and is the occupation of the Agolanti"?

Question

In Day 2 Story 3 of the Decameron:

There was formerly in our city a knight, by name Messer Tedaldo, of the Lamberti, according to some, or, as others say, of the Agolanti family, perhaps for no better reason than that the occupation of his sons was similar to that which always was and is the occupation of the Agolanti.

Original Italian:

Fu già nella nostra città un cavaliere il cui nome fu messer Tebaldo, il quale, secondo che alcuni vogliono, fu de' Lamberti, e altri affermano lui essere stato degli Agolanti, forse piú dal mestier de' figliuoli di lui poscia fatto, conforme a quello che sempre gli Agolanti hanno fatto e fanno, prendendo argomento che da altro.

The Agolanti family were a real family in Italy, but I couldn't find any information on their (real or reputed) occupation. What does this "occupation" remark refer to?

Answer 1

In the introduction ("introduzione") to the article "Gli Agolanti" by Enrica Guerra you can find that they were usurers ("usurai"):

Boccaccio, [...], nel momento in cui menziona gli Agolanti conosce perfettamente la loro attività, sia, probabilmente, per le sue stesse esperienze in ambito mercantile, al servizio dei Bardi, sia per la fama, ovvero notorietà pubblica, che tale attività conferì loro: quella di usurai.

My translation:

Boccaccio, [...], at the moment in which he mentions the Agolanti, knows their activity perfectly, probably due to his own similar experiences in the mercantile field, at the service of the Bardi, and also because of the fame or public notoriety that this activity conferred them: that of usurers.

Also the note to your quoted text in BUR version of the Decameron (Italian original), edited by Amedeo Quondam, Maurizio Fiorilla and Giancarlo Alfano mentions that "which always was and is the occupation of the Agolanti" is

prestare denaro

that is, lending money at usury.