Erebor
In "The Hobbit", Beorn received Gandalf, Bilbo Baggins and 13 Dwarves and aided them in their quest to reclaim their kingdom beneath the Lonely Mountain. He was convinced of their trustworthiness after confirming their tale of encountering the Goblins of the Misty Mountains and Gandalf's slaying of their leader, the Great Goblin. In addition to giving the group much-needed supplies and lodging, Beorn gave them vital information about what path to take while crossing Mirkwood.