A more recent, extensive and in-depth history of the family was published in 2001:', by Mark Haggar.
It is a valuable and much appreciated addition to the many texts that enlighten our knowledge of the de Verduns, but its understandable focus on the main line of the family means that it omits useful data from French historical sources and therefore mention of what might be the senior branch of the family, who continue to reside in Normandy, and whose story continued to connect with England, during the times that Normandy was ruled by that country's kings.
French genealogists give Richard de Surdeval, who lived near the comital centre at Mortain, a descent from Verdun, on the Meuse; and Bertram de Verdun's presence at a place in the Avranchin called, evocatively enough, Bouillon, speaks for itself".
: The original purpose of this page was to provide more information about the heraldry of the Vardons of Goldstone, but in the process it has become extended, providing more data on the broader inter-related branches of the de Verdun/Verdon families in England, Normandy and Ireland, in case this may be of added interest for anyone seeking more knowledge about this Norman family.
Readers should be aware that this is very much 'a work in progress' and contains incomplete details, sometimes placed here purposely like pieces of a jigsaw puzzle that there hasn't been time to put into the correct places, with some sections completed but interconnecting links remaining missing.
After his death, his younger brother Baldwin became the first crusader king of Jerusalem.
What Platts writes above is of additional interest because the 1st Earl of Chester of the second creation, Hugh d'Avranches succeeded his father Richard le Goz as Vicomte of Avranches and the de Verdun family held lands in Normandy and England from Hugh and his descendants.