Thorin

Thorin II was the grandchild and heir of the dwarf-king or Erebor, Thror. But Erebor has been destroyed and occupied in Thorin's youth by the dragon Smaug. Thorin escaped only by chance - he wasn't at home. His father Thrain II escaped through a secret door.
For many years Thorin lived in exile, in Dunland and in the Blue Mountains, always thinking of vengeance on Smaug and the reestablishment of the kingdom. But to the realisation of the plan it came not until much later. Thorin was now the head of his people, when he met Gandalf and told him of his situation. Gandalf organized the quest for Erebor and gave Thorin a burglar on his side: Bilbo Baggins.