In the left aisle of the Saint Michael and Saint Gudula cathedral you can see a series of nineteenth-century neo-Gothic stained glass windows. They show an anti-Semitic fabrication known as 'The Mystery of the Blessed Sacrament'. The story is that Jews would have pierced wafers with knives, after which those wafers miraculously started to bleed. In the 14th century, Duke Wenceslaus would execute 6 innocent Jews in Brussels. That is also depicted on these stained-glass windows.
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