Cosimo di Giovanni de' Medici was an Italian banker and politician who established the Medici family as effective rulers of Florence during much of the Italian Renaissance. 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. He spent over 600,000 gold florins on art and culture, including Donatello's David, the first freestanding nude male sculpture since antiquity.

The House of Medici was an Italian banking family and political dynasty that first consolidated power in the Republic of Florence under Cosimo de' Medici, during the first half of the 15th century. The family originated in the Mugello region of Tuscany, and prospered gradually until it was able to fund the Medici Bank. This bank was the largest in Europe during the 15th century and facilitated the Medicis' rise to political power in Florence, although they officially remained citizens rather than monarchs until the 16th century.