Sir Robert endowed the priory with six virgates of land in Sandford parish. Subsequent members of the de Sandford family made further endowments: another nine virgates of land in Sandford, 10 shillings a year from Wytham, tithes from Bayworth and Lambourn, and land at Garsington, Kennington, Sydenham, Oxfordshire and Liverton in the parish of Chilton. At one time the priory also claimed the advowson of St Mary's parish church at Puttenham, Hertfordshire and held land at "Bureweya" or "Bergheia" (Barway) in the parish of Soham in Cambridgeshire. King Henry III paid 40 shillings a year to maintain a "prebendaria" at the priory and in 1232 granted the priory one hide of land at Hendred.