The parentage of Gundrada has been debated for centuries. Sadly, she cannot have been the daughter of Henry I, as claimed above, because she married before 1070 and Henry was born in 1068 and we know she was born in Flanders. William The Conqueror does, indeed, call her his child in documents, but she is never quoted as being one of his daughters by Matilda of Flanders in his lifetime. One historian in the 19th C claimed she was Matilda's daughter by another man before she married William, but there is no documentary evidence for this (though at least one novel I have read makes it a central issue). She appears to be related to Gerbod the Fleming, Earl of Cheshire, and his brother Frederic, almost certainly a sister. It appears though, that she was raised by Matilda. It was not uncommon for royal women to take orphans of noble birth into their families and raise them alongside their own children. Edward III's wife Philippa of Hainault did this for the children of Paon de Roet, and like Matilda, found them good husbands. In Gundrada's case, she was married to William de Warenne, Earl of Surrey,(whose grandmother was probably sister to Richard I of Normandy, therefore was close kin to William I). She died in childbirth in 1085.