 Millau was a protestant stronghold.In the 18th century, Louis XV created the "Marquisat de Pégayrolles" with Castelnau as its principal town.The marquis was Etienne Hypolite de Pegayrolles, President of the Parliament in Toulouse and the family moved into the chateau and turned it from a mediaeval fortress to a residential chateau and redecorating with trompe d'oiel paintings.