Question: What bank was founded by the great-great-great grandfather of the second Duke of Florence?
Sentence (from "Giovanni di Bicci de' Medici"): While other family members, such as Chiarissimo di Giambuono de' Medici, who served in the Signoria in 1201, and Salvestro de' Medici, who was implicated in the Ciompi Revolt of 1378, are historically significant, Giovanni's founding of the family bank truly began the family's rise to power in Florence.
Relevant evidence: No