The Duke of Montferrat was a title held by the rulers of the historical region of Montferrat in northern Italy. This area was known for its strategic location and rich cultural heritage during the Middle Ages and the Renaissance. The dukedom was established in the 14th century and played a significant role in regional politics, often aligning with powerful families and states. The title was held by various noble families, including the Paleologi and later the Gonzaga. The last Duke of Montferrat, William IX, died in 1708, leading to the dissolution of the duchy. The region is now part of the modern Italian provinces of Alessandria and Asti.