In 1094, Roger the Poitevin founded the Benedictine priory of St. Mary at Lancaster, as a cell of the Norman Abbey of St. Martin in Sées. He endowed the priory with the church and land at Poulton. Roger was eventually banished from the country and his lands returned to the possession of the Crown. In 1194 King Richard I granted the hundred of Amounderness to Theobald Walter, 1st Baron Butler, who held it until his death in 1206. In 1268, King Henry III granted the wapentake of Amounderness to his son Edmund Crouchback, who became the 1st Earl of Lancaster around this time.