 By tradition Richard de Grenville is said by Prince (died 1723), (apparently following "Fuller's Worthies") to have founded Neath Abbey and bestowed upon it all his military acquisitions for its maintenance, and to have

However, according to Round (died 1928) "no proof exists that Richard I de Grenville ever held the manor of Bideford, which was later one of the principal seats of the Westcountry Grenville family.It was however certainly one of the constituent manors of the Honour of Gloucester granted by King William Rufus to Robert FitzHamon.