The see is in the City of Salisbury where the bishop's seat is in the Cathedral Church of the Blessed Virgin Mary.Cornwall was added to the diocese at the end of the ninth century, but in about 909 the diocese was divided in three with the creation of the bishoprics of Wells, covering Somerset, and Crediton, covering Devon and Cornwall, leaving Sherborne with Dorset.Following the Norman Conquest, the 1075 Council of London united his two sees as a single diocese and translated them to the then-larger settlement around the royal castle at Old Sarum.Disputes between Bishops Herbert and Richard Poore and the sheriffs of Wiltshire led to the removal of the see in the 1220s to New Sarum (modern Salisbury).Reforms within the Church of England led to the annexation of Dorset from the abolished diocese of Bristol in 1836; Berkshire, however, was removed the same year and given to Oxford.