Dapplegrim

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. Dapplegrim is a Norwegian fairy tale. Andrew Lang included it in The Red Fairy Book.

The youngest of twelve sons goes off to serve the king for a year. The king's daughter had been carried off by trolls, but no one can discover anything about where she is, although the king has offered half the kingdom and the princess's hand in marriage to anyone who can bring her back.

When he returns home, his parents had died, and his brothers had already split up the entire estate except twelve mares, and they give them to him as his portion...