The House of Penthièvre was a noble family in France, known for its significant influence during the medieval and early modern periods. It originated from the Duke of Brittany and was closely associated with the royal family, particularly through marriages and alliances. The house played a vital role in the politics of the time, especially in the regions of Brittany and Normandy. Members of the House of Penthièvre held various titles, including the Duke of Penthièvre. They were known for their wealth and land ownership, which contributed to their power. The family's prominence declined in the 18th century, but their legacy remains an important part of French history.