Ottone Visconti was a prominent Italian nobleman and the first Duke of Milan, ruling from 1277 until his death in 1295. He was a member of the powerful Visconti family, which played a significant role in the politics of northern Italy during the Middle Ages. Ottone was known for his efforts to consolidate power in Milan and expand its influence over surrounding territories. Under Ottone's leadership, Milan became a major political and economic center. He was instrumental in establishing the city's governance and fortifications, which helped protect it from rival factions. His reign laid the groundwork for the future prosperity of Milan and the continued prominence of the Visconti dynasty.