The Renaissance began in Italy in the late middle ages and spread across Europe. It was characterized by a revival of learning based on classical sources. Three important factors in the rise of the Renaissance were the growing wealth and power of Italian city-states like Florence, Venice, and Milan due to trade, which enabled cultural development; the rediscovery of ancient Greek and Roman texts, thanks to scholars like Petrarch; and new artistic techniques and perspectives developed by artists like Leonardo da Vinci, Michelangelo, and Raphael that mimicked nature. The movement enhanced science, philosophy, art, and literature.