“The process of colouring glass was probably invented in ancient Egypt. But it was during the Middle Ages that the making of stained-glass windows developed as a major art. Stained-glass windows were an important feature of churches built in the Gothic style, which first arose in the mid-1100’s. The windows filled the church interiors with light and colour, delighting worshipers with their beauty.
The windows were not only beautiful; they also served an educational purpose. During the Middle Ages, the church was the centre of learning. There were a few books, and only a handful of people could read. The designs in the first stained-glass windows usually depicted scenes from the Bible. Such scenes were important tools in teaching Christian beliefs to the people.” (Source: Stained-Glass Windows from The New Book of Knowledge® http://www.scholastic.com/browse/article.jsp?id=3754175
Bible scenes in ‘stained glass window’