[1] Andrew Lang included it in The Green Fairy Book as The Crystal Coffin.
In the morning, the tailor awoke to witness a fight between a great stag and a wild boar.
The maiden told him her story: She was the daughter of a rich count, and after the death of her parents, she had been raised by her brother.
In revenge the magician then turned her brother into the stag, imprisoned her in the glass chest (coffin), and enchanted all the lands around them.
The tailor and the maiden emerged from the enchanted hall and found that the stag had been transformed back into her brother.