This article refers to the son of Dáin II Ironfoot. For other namesakes, see Thorin (disambiguation).

Thorin III Stonehelm (Third Age 2866 – Fourth Age) was the son and heir of Dáin II Ironfoot of Durin's folk, who was king of the Dwarves of Erebor and the Iron Hills in Wilderland.


During the Lordship of his father, Thorin was more than likely born in the Iron Hills to Dáin II Ironfoot. During his younger years he saw his people able to finally return to the Lonely Mountain after many years of further exile, and wandering. He himself became a prince with the rise of his father as King under the Mountain, and over all the Longbeards.

During the War of the Ring at the age of one hundred fifty-three, Thorin fought the Easterlings in the Battle of Dale, and took refuge in Erebor after his father was killed at its gates, along with Brand king of Dale. Thorin then became King under the Mountain.

When the news of Sauron's defeat in the South came to the ears of the enemy, they became dismayed and the Dwarves and Men came forth from the mountain and routed them driving them back of the river Carnen, never troubling them again.[1]

He became King under the Mountain when his father Dáin was killed during the War of the Ring in 3019. Thorin III helped rebuild the Lonely Mountain and Dale, and prospered. His realm became a close ally of the Reunited Kingdom of Arnor and Gondor of King Elessar.

During his rule, Gimli, son of Glóin, led a number of Dwarves south to the Glittering Caves, where a new kingdom was settled. Also during his rule mining for Mithril in Moria slowly began again, although Moria was not yet permanently settled.

Thorin III had a descendant, who was held to be the reincarnation of Durin the Deathless, and who succeeded him at his death as Durin VII the Last.[1]

House of DurinEdit

Dáin I
Thráin II
Thorin II
Dáin II Ironfoot
Thorin III
King of Durin's Folk
Preceded by
Dáin II Ironfoot
Thorin III Stonehelm Succeeded by
Eventually Durin VII
TA 3019 - FO 137
King under the Mountain
Preceded by
Dáin II Ironfoot
Thorin III Stonehelm Succeeded by
TA 3019 – FO 137


  1. 1.0 1.1 The Lord of the Rings, Appendix B: The Tale of Years (Chronology of the Westlands), "The Chief Days from the Fall of Power Door to the End of the Third Age"