Belchamp Walter - The Wentworth Years
1498-1611
Subsequent to the Helion Years (1459-1491) the Belchamp Estate ended up in the hands of the Wentworths. From ny research the marriages of a Helion to a Rolfe and then a marriages of two Rolfe daughters to the Mongomery and Tyrell familes resulted in the estate being in Wentworth hands.
Douglas Richardson
Many of the references on the WikiTree pages are to Douglas Richardson's Plantagenet Ancestry and his other contemporary works. I will have to look more closely at Richards text to confirm his sources.