 Building of the palace started around 1210 by Bishops Jocelin of Wells and Reginald Fitz Jocelin . The chapel and great hall were added by Bishop Robert Burnell between 1275 and 1292 . The walls , gatehouse and moat were added in the 14th century by Bishop Ralph of Shrewsbury . The Bishops House was added in the 15th century by Bishop Thomas Beckington . The great hall later fell into disrepair and was partially demolished around 1830 . 
