Que Sais Je? by Jean Patou: launched in 1925. Created by Henri Almeras in collaboration with Raymond Barbas, who was Patou's brother-in-law as well as one of his chief perfumers. It was reported by Life magazine in 1933, that Barbas was the one who named the perfume.
Patou introduced three fruit-floral fragrances evoking the three stages of love: Amour Amour (Love, Love), Que Sais-Je? (What Do I Know?), and Adieu Sagesse (Goodbye Caution/Farewell Wisdom).