Alys, Countess of the Vexin (4 October 1160 Рc. 1220) was the daughter of King Louis VII of France and his second wife Constance of Castile.Some genealogical sources and websites, relying on P. Anselme, Histoire g̩n̩alogique et chronologique de la maison royale de France, 1725 (vol. 1 p. 77), state that Alys was born in 1170. This is impossible, not only because she was betrothed in January 1169, but because she must have been of marriageable age in 1177, when the Pope demanded that she be married immediately.