 Suger was a follower the philosopher John Scotus Eriugena (810-877), who wrote that God was "the supra-essential light", and of a Sixth Century mystic and philosopher called the Pseudo-Dionysius, who wrote that all visible things are "material lights" which reflected the infinite light of God himself.Therefore Suger ordered his architects to remodel the Basilica to bring in the maximum amount of light.Between the dedication of the choir at Saint-Denis, Paris, in 1144 and the completion of Henry VII's Chapel at Westminster Abbey in 1519, there were nearly 400 years of stylistic development in Gothic architecture.