“ He often used to say there was only one Road; that it was like a great river: its springs were at every doorstep and every path was its tributary. “It’s a dangerous business, Frodo, going out of your door,” he used to say. “You step into the Road, and if you don’t keep your feet, there is no telling where you might be swept off to.” ”

    — Frodo Baggins about Bilbo, The Fellowship of the Ring

Bilbo Baggins was a Hobbit who lived in The Shire during the final years of the Third Age. His adventure with the dwarves Thorin and company earned him a fortune, and brought the One Ringof Sauron back into knowledge.

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Bilbo Baggins was born on September 22 in the year 2890 of the Third Age. He was the son of Bungo Baggins and Belladonna Took and a grandson of the Old Took.

During his youth Bilbo attended several parties during which he loved to listen to Gandalf's stories and was impressed by the his fireworks. In the eyes of his neighbours, he originally seemed just like his father, a solid, sensible, unadventurous and respectable hobbit. But when becoming older he started to become "strange" and often left his home for many days to meet with strangers, including Dwarves.

Later Gandalf managed to address him on a morning, while he sat outside his hobbit-hole. He reluctantly asked Gandalf for tea next day. Indeed Gandalf came back, bringing thirteen Dwarves with him. The Dwarves remained in Bag End for supper and afterwards  explained the reasons for their unannounced coming: the Dwarves begun a quest to reclaim the Lonely Mountain and Gandalf had volunteered Bilbo to be the company's burglar. Thus the Hobbit became the fourteenth member of the company.

* * * * It follows the "Quest to Erebor", of which I assume you know what exactly happend or if not that you want to read "the Hobbit" and so you will know it soon. Thank you for understanding that I just shortened it here. * * * *

After the Dragon Smaug was dead and when Thranduil and Bard came to the front gate of Erebor to bargain with Thorin, Bilbo was feared about the war, and to prevent this he gave secretly the Arkenstone into the hands of Bard. With the praise of Bard, Thranduil, and Gandalf he returned, only to be rejected and cast away for his deed by Thorin. But Bilbo was successful in that Thorin was willing to negotiate, and war was prevented temporarily.

Dáin II Ironfoot, at the summons of Thorin, came from the Iron Hills with an army of Dwarves. But just as battle was about to be ed, Gandalf called them all to be wary of the new coming danger - the alliance of Wargs and Goblins against them. Thus the  Battle of Five Armies get fought.

The battle was won but Bilbo did not see this result because a falling stone knocked him out. Invisible as he was, his bruised body was not discovered until the next day. Bilbo then bade farewell to the mortally wounded Thorin and his other friends.

The victors divided the treasure and Bard took Bilbo's fourteenth share of the gold and silver in return for the Arkenstone. Bilbo, despite having forfeited his share, was offered a rich reward but refused to take more than two small chests of gold and silver and then he returned with Gandalf to the Shire. There he discovered that he was believed dead, and an auction was going on of his house and possessions. He bought back his own things, and settled once more peacefully into Bag End.

Bilbo lived on in health and comfort, high in the regard of those who knew him best, but considered somewhat of an oddity. He adopted his young cousin Frodo Baggins as his heir, and raised him in Bag End. Occasionally he received visitors; dwarves, Gandalf, or even elves from time to time. Most of his time was spent reading, writing his memoirs, writing poetry, and avoiding his nasty relatives the Sackville-Bagginses. His life was extended by the ring (the One Ring, which he found on his quest to Erebor), and yet as he lived on with no apparent sign of ageing, he began to feel stretched and thin.

In September of 3001, Bilbo threw a party for his 111th birthday (which happened to be shared with Frodo Baggins). During this party he did a vanishing act with his ring and left with three dwarves for Rivendell, to live with Elrond and the elves there. He left the ring with Bag End to Frodo. Bilbo was the first ringbearer to give up the One Ring in this way.

Two years after the war of the ring was fought, Bilbo as a former ringbearer accompanied Frodo Baggins, Gandalf, and certain Elves to the Grey Havens, there to take a ship into the west of Arda. He had already celebrated his 131st birthday, becoming the oldest Hobbit in the history of Middle-earth. As a mortal, he died in the West.