↑ 3.03.13.23.33.4 Cawley, Charles. Medieval Lands: A prosopography of medieval European noble and royal families. Hosted online by the Foundation for Medieval Genealogy (FMG), accessed 2023, Family of Thurstan Haldup.
Richardson, Douglas. Royal Ancestry: A Study in Colonial and Medieval Families (2013) Vol. V, p. 489.
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Seems to be some date issues for many generations back or maybe the issue is with dates going forward. Richard's birth (1013) is after his son's Ranulf's birth (960).