Cantiga 148 of Las Cantigas de Santa Maria of Alfonso X
The Knight who was Protected by a Linen Shift
The Virgin’s linen shift was stored in a chest at Chartres.
It was the custom for people to hold pieces of cloth against the relic and have shifts made to measure from the material.
A knight, wearing such a garment, was attacked by his enemies.
Although they tried to pierce him with lances, they were unable to wound him.
His squires raised the alarm and people came and discovered him alive.
His shift was found intact.