The House of Toulouse was a noble family in medieval France, known for its influence and power in the region of Occitania. It originated in the 10th century and played a significant role in the political landscape of southern France, particularly during the Crusades and the Albigensian Crusade. The house is most famously associated with the Counts of Toulouse, who ruled the area and were patrons of the arts and culture. Their legacy includes the promotion of Catharism, a religious movement that emerged in the region, and the establishment of important architectural works, such as the Basilica of Saint-Sernin.