Dofri

Dofri, the Giant of Dofrafjall
WARNING - POTENTIAL SPOILERS AHEAD!

Dofri was a giant who dwelt upon a mountain named for him, the Dofrafjall, located between Heidhmork and Throendalog in Noregur. Dofri was a rather barbaric outcast from his people, the Jotnar of Jotunheimur. During the reign of King Halfdanur hinn Svarti (Halfdanur the Black), Dofri raided the human settlements of Noregur until captured by forces under the command of the king. The king's son, the young Haraldur (the future King Haraldur Halfdansson the Einkonungur) tried to argue for the giant's life, since he could make a powerful ally. King Halfdanur hinn Svarti (Halfdanur the Black) refused his son, declaring that anyone who tried to save the giant would forfeit his life.

Young Haraldur decided to defy his father and release the giant, cutting his bonds. Dofri then escaped back to Dofrafjall. When the king discovered his son's treachery, he could not bear to slay his son, but rather cast him out as an outlaw. Young Haraldur escaped to the Dofrafjall and was fostered for about nine months by the giant '''Dofri. Dofri '''spoke to the young prince of dark prophecies from the world of Jotunheimur that spoke of him as a great king (King Haraldur Halfdansson the Einkonungur). Dofri seemed to take it as a holy responsibility to his god, Thrymur, King of the Frost Giants, to protect and preserve Haraldur, who was foretold to be a powerful force againt Odhinn in the preparations for Ragnarokkur.

Eventually, King Halfdanur hinn Svarti (Halfdanur the Black) repented of his words and recalled his son from banishment. Dofri returned the boy Haraldur to his father's kingdom, but remained an ally of the boy as he grew to be a powerful man and king in his own right.

Appears in: "The Tale of Halfdanur the Black"

Source: A character from Norse lore, including the Heimskringla.