 Construction began around 1210 by Bishop Jocelin of Wells but principally dates from 1230 . Bishop Jocelin continued the cathedral building campaign begun by Bishop Reginald Fitz Jocelin , and was responsible for building the Bishop 's Palace , as well as the choristers ' school , a grammar school , a hospital for travellers and a chapel within the liberty of the cathedral . He also built a manor house at Wookey , near Wells . The chapel and great hall were built between 1275 and 1292 for Bishop Robert Burnell . The windows had stone tracery . Stone bosses where the supporting ribs meet on the ceiling are covered with representations of oak leaves and the Green Man . The building is seen as a fine example of the Early English architectural style . 
