 She granted these lands at Snelshall to the Benedictine monks of Lavendon, to start a religious community - Snelshall Priory.Sybil d’Aungerville’s grandson Ralph Martel gave some more of his land at Tattenhoe in 1216 to the lands already given to Snelshall Priory.Over 100 donations were given to the Priory during the following 100 years, some of these large, including the donations of the fishponds around St. Giles’s.