also features fine medieval stained glass and, above the altar, The Adoration of the Magi by Rubens, painted in 1634 for the Convent of the White Nuns at Louvain in Belgium. The painting was installed in the Chapel in 1968; this involved the lowering of the Sanctuary floor leading up to the High Altar. It had been believed that gradations were created in 1774 by James Essex, when Essex had in fact lowered the floor by 5 1/2 inches, but at the demolition of these steps, it was found that the floor instead rested on Tudor brick arches. During the removal of these Tudor steps, built at the Founder's specific request that the high altar should be 3 ft above the choir floor, human remains in intact lead coffins with brass plaques were discovered, dating from the 15th to 18th centuries, and were disinterred. The eventual installation of the Rubens was also not without problems: once seen beneath the east window, a conflict was felt between the picture's swirling colours and those of the stained glass. The Rubens was also a similar shape to the window, which "dwarfed it and made it look rather like a dependent postage stamp". Plain shutters were proposed, one on each side, to give it a triptych shape (although the picture was never part of a triptych) and lend it independence of form, which is how one sees the Rubens today. The installation was designed by architect Sir Martyn Beckett, who was "philosophical about the furore this inevitably occasioned - which quickly became acceptance of a solution to a difficult problem." During the Civil War the Chapel was used as a training ground by Oliver Cromwell's troops, but escaped major damage, possibly because Cromwell, having been a Cambridge student, gave orders for it to be spared. Graffiti left by these soldiers is still visible on the north and south walls near the altar. During World War II most of the stained glass was removed and the Chapel again escaped damage. Great windows The windows of King's College Chapel are some of the finest in the world from their era. There are 12 large windows on each side of the Chapel, and larger windows at the east and west ends. With the exception of the west window, they are by Flemish hands and date from 1515 to 1531. Barnard Flower, the first non-Englishman appointed as the