 The north wing ( now the Bishop 's House ) was added in the 15th century by Bishop Beckington , with further modifications in the 18th century , and in 1810 by Bishop Beadon . It was restored , divided , and the upper storey added by Benjamin Ferrey between 1846 and 1854 . Following the Dissolution of the Monasteries in 1548 , Bishop Barlow sold Edward Seymour , 1st Duke of Somerset the palace and grounds . These were recovered after the Duke 's execution in 1552 . 
