The House of Ponthieu was a noble family in medieval France, known for its influence in the region of Ponthieu. This house played a significant role in the feudal system, holding lands and titles that contributed to the political landscape of the time. Members of the House of Ponthieu often intermarried with other noble families, including the House of Capet and the House of Plantagenet. Their alliances helped shape the power dynamics in northern France and England during the 11th to 13th centuries.