“This change began to show itself in the choir and transepts of Gloucester Cathedral before the middle of the Fourteenth Century. The panelling and the window-tracery have so much the appearance of the Perpendicular Style, that they have been commonly supposed to have been rebuilt or altered at a late period; but the vaultings and the mouldings are pure Decorated, and the painted glass of the Fourteenth Century is evidently made for the places which it now occupies in the heads of the windows with Perpendicular tracery; it must therefore be considered as the earliest known example of this great change of style. In this work of alteration the walls and arches of the Norman church were not rebuilt but cased with panelling over the inner surface, so as to give the effect of the latter style to the interior. This was just the same process as was afterwards followed at Winchester by William of Wykeham, in changing the Norman to the Perpendicular style without any actual rebuilding.”--(J. H. P.) The work at Gloucester was begun as early as 1337. Another fine example is the nave of Winchester Cathedral. Bishop Edington, who died in 1366, began to alter Winchester into the Perpendicular style. His work was continued by William of Wykeham. “Before the death of Bishop Edington the great principles of the Perpendicular style were fully established. These chiefly consist of the Perpendicular lines through the head of the window, and in covering the surface of the wall with panelling of the same kind. These features are as distinctly marked at Winchester as in any subsequent building, or as they well could be.”--(J. H. P.) The cloisters of Gloucester Cathedral are decidedly Perpendicular in the fan-tracery of the vaults, but are partly of earlier date and character. Another example of the transition from Decorated to Perpendicular is the choir of York Minster, begun in 1361 and finished in 1408. Its general appearance is Perpendicular.