12th Century (Middle ages) (jan 1, 476 – jan 1, 1200)
Description:
https://mymodernmet.com/stained-glass-history/#:~:text=Evidence%20of%20stained%20glass%20dates,early%20as%20the%204th%20century.By the Middle ages, stained glass windows could be found in countless Catholic churches across Europe. Until the 12th century, however, these windows were relatively simple, small in scale, and outlined by thick iron frames.
Added to timeline:
Date:
jan 1, 476
jan 1, 1200
~ 724 years