Bilbo Baggins is the protagonist of The Hobbit and also makes a few appearances in The Lord of the Rings, two of the most well-known of J. R. R. Tolkien's fantasy writings. The story of The Hobbit featuring Bilbo is also retold from a different perspective in the Chapter The Quest of Erebor in Unfinished Tales.
In Tolkien's narrative conceit, in which all the writings of Middle-earth are translations from the fictitious volume of The Red Book of Westmarch, Bilbo is the author of The Hobbit and translator of The Silmarillion.
The Hobbit relates how Bilbo Baggins (in comfortable middle age at 50 years old) is hired in spite of himself as a burglar by Gandalf and thirteen dwarves led by their king Thorin Oakenshield on a quest to reclaim the Lonely Mountain and its treasure from the dragon Smaug. The adventure takes Bilbo and the companions through the wilderness, to the haven of Rivendell, across the Misty Mountains and the black forest of Mirkwood, to Lake-town in the middle of Long Lake, and eventually to the Mountain itself. Here, after the dragon is killed and the Mountain reclaimed, the Battle of Five Armies takes place.
In his journey, Bilbo encounters other fantastic creatures, including trolls, elves, giant spiders, a man who can change shape into a bear, goblins, eagles, wolves and a mysterious, murderous creature named Gollum. Underground, near Gollum's lair, Bilbo accidentally finds a magic ring of invisibility, which he uses to escape from Gollum.
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Official Site: J.R.R. Tolkien
Links: Wikipedia tuckborough.net Encyclopedia of Arda