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York Minster contains 128 windows that illustrate the arts and craft of glass painting over a period of 800 years.
Much of the ancient glass came from Germany and was transported across the North Sea and up the River Ouse. Mediaeval glass varied in quality and the poorer glass has suffered from erosion. A distinctive style of glass painting developed known as the York School, and was used in windows across the whole city. Windows were often given by Donors, who sometimes portrayed themselves in the window.
The windows here are often referenced by an old numbering system (normal numbers) as well as the new notation of the Corpus Vitrearum Medii Aevi which is now standard, denoted by Roman numerals prefixed by position in the church.

York Minster is a Gothic cathedral and is one of the largest of its kind in Northern Europe. The Minster is the seat of the Archbishop of York, the second-highest office of the Church of England, and is cathedral for the Diocese of York.
The first church on the site was a wooden structure built hurriedly in 627 AD. A stone structure was completed in 637 AD, since which the Church has undergone many refurbishments as well as serious damage including a fire in 1984 which destroyed the roof in the south transept.
Link
York Minster website: Link