Arnaud Guillaume (also Arnault Guilhem), Seigneur de Barbazan, (1360 in Barbazan-Dessus, Hautes-Pyrénées, France – 1431, Vaudoncourt, Vosges, France) was a counsellor and butler to Charles VII of France and later a general during the Hundred Years' War who earned for himself the name of the Irreproachable Knight.
The nearby village of Fornet-Dessus belongs to the municipality of Lajoux.
An influential formulation of 1667 by André Félibien, a historiographer, architect and theoretician of French classicism became the classic statement of the theory for the 18th century:Celui qui fait parfaitement des païsages est au-dessus d'un autre qui ne fait que des fruits, des fleurs ou des coquilles.