Bertram de Verdun, of Great Moulton

"Both Bertram and William patronised Thetford and Blytheborough priories and Sibton abbey, and it is the cartularies of these houses that allow their earlier successors to be identified. Philippa Brown, who has edited the Sibton abbey cartulary, has already provided the framework of the family down to the 1250's and this can be used as the basis for reconstructing the descent of this cadet branch here. Bertram de Verdun was still alive in 1213 when he had interests in Great Moulton, the manor which had featured in Ivo de Verdun's grant to Thetford priory, but when he died and whether he had any heirs is not known."

Mark S. Hagger ; Fortunes of a Norman Family: The de Verduns in England, Ireland and Wales, 1066-1316 ; Four Courts Press, 2001