The White Dove

Andrew Lang was a Scots poet, novelist, and literary critic. He is best known as a collector of folk and fairy tales. Lang gave many of the tales their first appearance in English. 
Andrew Lang's Fairy Books — are a series of twelve collections of fairy tales. Each volume is distinguished by its own color. In all, 437 tales from a broad range of cultures and countries are presented. The White Dove is a Danish Fairy Tale, included by Andrew Lang in The Pink Fairy Book.
A witch rescues two princes from a storm at sea on the condition of receiving their younger (not yet born) brother. Years later, she claims him, and he goes with her, since they promised. She sets him to sort feathers, and when he does, a whirlwind mixes them up again. A white dove taps on the window and offers to help, and sorts all the feathers. The next day he's set to chop wood, and the pile keeps growing the longer he works. The dove again helps, splitting all the wood. The prince thanked her and kissed her, and she turned into a lovely woman…