Why there is no Islamic architecture with glass in windows before 18th century? Glass windows frequently appear in gothic architecture since 11th century but why Medieval Islamic architecture lack glasswork?
In addition to its European influences, Islamic architecture was most heavily influenced by Persian architecture. That's because the climate of Persia was most representative of that of most of the Islamic world.
The latter made heavy use of tiles to cover its domes, and even its windows. Creating windows with glass would have been "redundant" with tiles, which is why Islamic architecture did not use glass until the Middle Ages were long past.