The House of Montfort is a noble family that originated in the region of Montfort-l'Amaury in France. It gained prominence during the medieval period, particularly through its connections to the Crusades and various European royal families. The house is known for its significant role in the political and military affairs of the time. Members of the House of Montfort were involved in various conflicts, including the Albigensian Crusade, and held titles such as Duke of Brittany and Count of Leicester. The family's legacy includes contributions to the feudal system and the establishment of several important castles and estates across France and England.