According to question, they gained power through its success in commerce and banking.
Throughout the Renaissance, Florence was governed by the Medici family. Through their support of the arts and humanism, they had a significant impact on the development of the Italian Renaissance. The Medici family worked as bankers and merchants of wool. The family became extremely wealthy because both businesses were extremely profitable.
A sizable portion of Casino's power over Florence came from the wealth he controlled through the Medici bank. Casino was also able to use his immense wealth to gain power politically. He oversaw the family's banking operations in his capacity as head of the Medici family.
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