Devizes Castle was built by Osmund, Bishop of Salisbury in 1080, but the town is not mentioned in the Domesday Book. Because the castle was on the boundaries of the manors of Rowde, Bishops Cannings and Potterne it became known as the "castrum ad divisas" ("the castle at the boundaries"), hence the name "Devizes". On John Speed's map of Wiltshire (1611), the town's name is recorded as "The Devyses". The first castle on the site was of the motte and bailey form and was probably made of wood and earth, but this burnt down in 1113.