In 1417 he enfeoffed at Berkeley Castle, shortly before his death, several feoffees to hold all his lands in trust, due to the fact he had no male children as his heirs and that the course of succession then seemed unclear.
Thomas FitzNicholl, one of the witnesses, was many times MP for Gloucestershire, including in 1395 when he served jointly with Gilbert Denys.
Nigel Saul states that such feoffees were likely to have been members of Lord Berkeley's retinue.
[4] These were very significant positions of trust granted to his feoffees as Berkeley died leaving only a daughter and the succession to the vast Berkeley lands, including the castle itself, became a matter of much dispute amongst his possible heirs resulting in a series of feuds which led in 1470 to the last private battle fought on English soil at the Battle of Nibley Green, between Lord William Berkeley and Viscount Lisle, and there followed the longest dispute in English legal history, which did not end until 1609.
[5] The brass shows him lying beside his wife, and is very similar to that of his contemporary Sir Maurice Russell (d.1416) at Dyrham, who was the father-in-law of Gilbert Denys, one of Berkeley's feoffees.