Cosimo di Giovanni de' Medici (27 September 1389 – 1 August 1464) was an Italian banker and politician who became the de facto first ruler of Florence during the Italian Renaissance, establishing the Medici family as its effective leaders for generations. His power derived from his wealth as a banker and intermarriage with other rich and powerful families. He was a patron of arts, learning, and architecture.

Key figuresCosimo de' Medici