Hvem daterte Ida de Tosny?

Ida de Tosny (or Toeny, or Tony) , Countess of Norfolk (died after 1181), was a Norman royal mistress. Named after her grandmother Ida de Hainaut, she was the daughter of Ralph IV de Tosny (died 1162) and his wife Margaret (born c. 1125 and living in 1185), a daughter of Robert de Beaumont, 2nd Earl of Leicester.

Circumstances of her early life are uncertain. She had at least eight children by Roger Bigod after 1182, so was likely born no earlier than 1150. Moreover, some sources put the date of marriage between her mother Margaret and her father Ralph at 1155 or later (which implies a date of birth between 1155 and 1162.) This, however, is difficult to reconcile with her identification as the mother of William Longespée, 3rd Earl of Salisbury, and his estimated birth date of circa 1167 (William is described as a young man in historical records in 1188-1190 and was likely of age by then.)

Despite her Norman ancestry, Ida was born and raised in Flamstead, Hertfordshire, England.