F'ing Medici's. Assassin's Creed got them wrong on purpose.
The Medici's kicked the Gherardinis (FitzGerald) out of Florence. Started big ol' bank. Sound familiar?
https://www.thevintagenews.com/2018/11/17/the-medici/
https://bigthink.com/mike-colagrossi/how-the-medici-family-created-and-lost-their-banking-empire
https://www.britannica.com/topic/Medici-family