Jeri, I think you mean Edward III's granddaughter, and she's more commonly called Anne of Gloucester (dau. Thomas of Woodstock, Duke of Gloucester). She married Edmund Stafford, 5th Earl of Stafford [CP XII/1:180-1]. The Staffords are descended from Robert de Stafford, a younger son of Roger de Toni [Loyd:99][CP XII/1:168, 757 note (c)]. It is believed that the unnamed wife of Robert de Stafford's grandfather, Ralph (II) de Toni, was possibly a member of a collateral branch of the Ducal family. According to Oderic Vitalis, Roger de Toni is descended [through his unnamed mother] from an alleged uncle of Rolf, the founder of Normandy [CP XII/1:755]. The name of this uncle (in Latin patruus meaning a father's brother) was thought to be Hulce, although no such brother of Ragnvald 'the Wise' is known. You still have a number of lines of descent from Rollo (Rolf/Hrolf) since both of Anne of Gloucester's parents were his descendants. And her husband Edmund obtains his line of descent from Rollo through his 4th great grandmother, Pernell de Ferrers (m. ca 1214 Hervey de Stafford)[CP XII/1:171]. Jim