The “House of Clifford,” Chapter 5: “Much controversy surrounds the identify of the mother of William, for Rosamund was not the King’s only mistress, though there are many who believe she was. Those who dispute Rosamund’s claim base their case on the disparity in the ages of all concerned, but there is other evidence as well which cannot be ignored. Unfortunately, the records date neither the birth of Rosamund nor that of her father, or her reputed sons. Documents also indicate an Ida, and a Ykenai as his mother. Died on Crusade.”