BBC Documentaries

Britain's Most Fragile Treasure (2011x188)

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Historian Dr Janina Ramirez unlocks the secrets of a centuries-old masterpiece in glass. At 78 feet in height, the famous East Window at York Minster is the largest medieval stained-glass window in the country, and it was the creative vision of a single artist - a mysterious master craftsman called John Thornton, one of the earliest named English artists.