Alice de Rumilly, Lady of Craven and of Skipton

William had several marriages. His first marriage was over, presumably through death, by the year 1137, when he married Alice de Rumilly, daughter of William Meschin. By the latter, he had a son, also called William (William of Egremont or William the Atheling), who died in 1160, and a daughter Cicely, Lady of Skipton, who married William le Gros, 1st Earl of Albemarle. https://en.wikipedia.org/wiki/William_fitz_Duncan

Meschin married Cecily, daughter of Robert de Rumily. They had one son, Ranulf Meschin, and three daughters, Alice, Avice,[2] and Matilda.[1] Another son, Matthew, who was the eldest son, died before his parents.[3]

Meschin died between 1130 and 1135. His widow married Henry de Tracy, and she died around 1151.[2] Skipton went to Alice, who married William fitzDuncan.[7] Alice and her first husband also acquired Egremont, after the death of her brother Ranulf without heirs.[4] After the death of fitzDuncan, Alice married Alexander fitzGerold. https://en.wikipedia.org/wiki/William_Meschin