 In 1133 Henry I founded a priory of Austin canons in the church of St. Mary, Portchester, within the walls of Portchester Castle.The foundation charter gave to the canons the church of Portchester, timber for fencing, building and fuel, common pasture in the wood of Hingsdon; the large manor of Candover; and a hide of land in 'each of' Southwick and Applestead.By the early part of the thirteenth century, the priory is referred to in charters (held at Lambeth Palace) as "Southwick Priory" and it is believed to have moved to the site in Southwick c.1145-1153.