Rumpelstilzchen.

The miller lies to the king that his beautiful daughter can spin gold from straw. The king, eternally in debt, marries the miller's daughter and locks her in a chamber to spin gold. Of course, she does not succeed. One night, a little man appears and offers his services to the young queen. He is prepared to spin as much gold as she wants for her first-born child. The young queen happily agrees. When her first child is born, she begs the male to let her have the child. The male relents, but demands that the queen find out his name.