King under the Mountain
Thorin III Stonehelm
Thorin III Stonehelm, son of Dáin Ironfoot, became King under the Mountain when his father fell in the Battle of Dale in T.A. 3019. He held Erebor under siege, broke it with Bard II when the news of Sauron's fall came, and ruled the Dwarves of the North into the Fourth Age.