According to Wikipedia, the Abbé Suger, “(c. 1081 – 13 January 1151) was a French abbot, statesman, and historian. He once lived at the court of Pope Calixtus II in Maguelonne, France. He later became abbot of St-Denis, and became a close confidant to King Louis VII, even becoming his regent when the king left for the Second Crusade.”
I remember learning in Art Humanities at university, that he called stained glass an analog of the virgin Mary because of the way light passing through it created something of beauty without penetrating (that is, breaking) the glass, as Mary was presumed to have been impregnated by the holy spirit.
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