Thomas Horton (1351-1377) finished the work, comprising the high altar, with the presbytery, the stalls on the Abbot's side, or south side of the choir. (Hart, i. 49.)
He also caused to be made the images and tabernacle work at the entrance of the choir on the north side, and in the six years, ending with 1374, he completed the casing of the north transept, defraying the greater part of the cost himself (£444, 0s. 2d. out of a total sum of £781, 0s. 2d.).
Horton also built "the Abbot's chapel near the garden of the infirmary, the covered camera of the monks' hostelry, and the great hall in the court, where the king afterwards held his Parliament in 1378." (Hart, i. 48, 50.)
The present cloister, as far as the door of the chapter-house, is also his work.
This important work was for many years unfinished, but was completed by Froucester in the years 1381-1407. As Leland says, "he made the cloyster a right goodly and sumptuous piece of worke."
In the one hundred and thirty years that elapsed between the finishing of the cloisters and the Dissolution many further important changes took place, both in the interior and in the exterior of the fabric.
John Morwent (1421-1437), utterly destroyed the west front, with its two towers, which, in the opinion of many, may have been counterparts of those at Tewkesbury. To him also is credited, mainly on Leland's authority, the insertion of the south porch.
Abbot Seabroke (1450-1457) took down the tower as far as the Norman piers, and built the present beautiful structure. He died before it was finished, and Robert Tully, one of the monks of the monastery, carried out the work, as the inscription on the wall in the interior (vide p. 63) testifies.
Before the tower was complete, the present Lady Chapel (which was finished before 1500) was begun by Abbot Hanley, and finished by Abbot Farley.
John the Baptist's Chapel is usually ascribed to Abbot John Browne (or Newton), from the similarity of his initials to those of the saint.