Duke Ercole I d'Este was the ruler of the Duchy of Ferrara from 1471 until his death in 1505. He was a member of the House of Este, a prominent Italian noble family. Ercole was known for his patronage of the arts and his efforts to enhance the cultural life of Ferrara, making it a center of Renaissance culture. Under his rule, Ercole I d'Este expanded the duchy's territory and strengthened its political position. He was also involved in various alliances and conflicts, navigating the complex political landscape of Renaissance Italy. His legacy includes the development of the Estense Castle and the establishment of the University of Ferrara.