The House of Montferrat was a noble family in northern Italy, known for its influence during the Middle Ages. It originated in the region of Montferrat, which is located in the present-day Piedmont area. The family played a significant role in the politics and culture of the region, often intermarrying with other powerful houses. The Montferrat family produced several notable figures, including William VI, who was a key player in the conflicts of the Crusades. The house eventually declined in power, and its territories were absorbed by other states, particularly the Duchy of Savoy, by the late 17th century.