Rumpelstiltskin

A boastful miller, hoping to impress the king, claimed his daughter could spin ordinary straw into pure gold. The king, greedy for such a talent, locked the poor girl in a tower room full of straw and a spinning wheel, demanding she produce gold by morning or face execution.

Weeping, with no idea how to perform such magic, she was startled by a strange little man who appeared and offered to spin the straw for her — in exchange for her necklace. He did so, and the delighted king only demanded more the next night. The little man returned, took her ring this time, and spun an even larger room of straw into gold.

On the third night, with nothing left to give, the little man made a new demand: her firstborn child, once she became queen — for by now the king had promised to marry her for her "talent." Desperate, she agreed. A year later, queen and mother, she was visited by the little man demanding his payment, though he offered one mercy: if she could guess his true name within three days, she could keep her child. By chance, she overheard him dancing around a fire, singing his own name — Rumpelstiltskin — and when she spoke it aloud, he shrieked in fury and vanished forever, never to trouble her again.