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. Because of his heroic service to France and to the king in the many battles he had participated in, Barbazan was buried at the Saint Denis Basilica next to the king himself, after a state funeral of a type usually reserved for kings.