Cantiga 73 of the Cantigas de Santa Maria of Alfonso X
The Stained Chasuble
The treasurer of a large monastery at Clusa loved and served the Virgin.
One Christmas, he went to place a white chasuble on the altar. He had the chasuble in one hand, and some sacramental wine in the other.
He stumbled, spilling the deep, red wine on the chasuble.
He was dismayed and terrified of what the abbot and the other monks would think.
As he was weeping, the Virgin removed the stain from the chasuble.
Everyone who heard of the miracle praised the Virgin, and pilgrims came to venerate the chasuble.
Source: upenn.edu
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