Before Marie Mancini and Louise de La Vallière, Louis XIV, aged tender sixteen, had a fling for a certain Mademoiselle de la Motte-Argencourt. Born in 1637 or 1638 to Pierre de Conty d’Argencourt and Madeleine de Chaumont de Bertichères, Anne-Madeleine de Conty d’Argencourt was around the same age as Louis XIV. She was baptised on September 20 in 1641 and entered the household of Anne d’Autriche later…