See David C. Douglas, William the Conqueror (1977): 93 (“At the beginning of Duk...

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See David C. Douglas, William the Conqueror (1977): 93 (“At the beginning of Duke William’s reign the vicomte of the Bessin was Rannulf, who was the son of a vicomte named Anschitil. He married a daughter of Duke Richard III and was among the defeated rebels at Val-ès-Dunes. None the less, the office continued in the family, for he was succeeded by another Rannulf (II) who was established at Avranches before the Norman conquest, and who survived until after April 1089. Moreover, this second Rannulf married Maud, daughter of Richard, vicomte of the Avranchin, thus linking together two powerfulvice-comital dynasties which were later in turn to determine the succession of the earldom of Chester.”). Cited by Wikipedia.

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