Who dated Alys of France, Countess of Vexin?

Alys of France, Countess of Vexin (4 October 1160 – c. 1218–1220), known in English as "Alice", was a French princess, initially betrothed to Richard I of England. Her engagement was broken in 1190, through negotiations between Richard and her half-brother Philip Augustus of France. Philip then attempted to betroth her to Richard's brother John but this betrothal was rejected. Alys married William IV, Count of Ponthieu, on 20 August 1195. She died between 1218 and 1220.