Thror

Thror was the father of Thrain and the grandfather of Thorin. Oakenshield. Thror had a mighty kingdom in The Mountain with many treasures. His mountain was attacked by Smaug the dragon and Thror's people were slaughtered and his kindom destroyed. Smaug claimed the mountain for himself. In the Hobbit, Thorin goes on a journey to reclaim the mountian and Thror's possesions as the new king.

Bibliography: http://www.sparknotes.com/lit/hobbit/terms/char_10.html J.R.R. Tolkien __The Hobbit__