The Old Woman in the Wood
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A beautiful but poor servant girl traveled with the family she worked for when robbers attacked them. She hid behind a tree, but no one else survived. She lamented her fate, and a dove came to her with a golden key. It told her to unlock a tree and she found food there. In the evening, it brought her one to a tree with a bed. She lived like this for many days. When the dove asked her to do something for it, she agreed. It told her to go to a house and go in. An old woman would greet her, but she should not answer. She should open an inner door, which will reveal a room full of splendid rings, but she should take a plain one.
The old woman was quite angry, but the girl did not heed her. Then, when she could not see the plain ring, she saw the old woman trying to carry off a bird cage. She took it away from her. It held a bird, which held the ring in its beak, so she took it outside and waited against a tree. Two branches turned into arms about her as the tree turned into a handsome man who kissed her. He told her that the old woman was a witch who had turned him into a tree, and for two hours a day, he became a dove, and she had freed him. All his attendants turned back from trees to humans as well. With the prince being a king's son, they went to his father's kingdom and got married.
In popular culture
"The Old Woman in the Wood" is featured in Grimm's Fairy Tale Classics, with several changes. The talking dove is an owl, his tree form only appears at the end, and in his owl form he has more direct interactions with the servant girl, here named Lisbeth. The witch attacks the family with a horde of goblins instead of a band of robbers. The tasks that Lisbeth faces are slightly different to the original ones: she must go inside the house without anyone noticing her (not even the Witch), look for a specific magical key in the witch's studio, use it on a specific door (which turns out to be the nose of a skull placed on top of a rotating shelf), then find the plain ring and bring it to the owl.