King under the Mountain

The King under the Mountain, also called the King of Erebor, was the hereditary title of the Dwarven ruler who resided at the Lonely Mountain. The King under the Mountain was also by right the King of Durin's Folk.
In The Hobbit, the dragon Smaug was held to be the only "king" of Erebor. Thorin II Oakenshield was the rightful King under the Mountain.
== Kings under the Mountain ==
Name 	Years 	Information
Thráin I 	TA 1999 - TA 2190 	He founded the first kingdom in the Lonely Mountain and discovered the Arkenstone.
Thorin I 	TA 2190 - TA 2210 	The son of Thráin I, he abandoned the Lonely Mountain in TA 2210.
Abandoned 	TA 2210 - TA 2590 	The Dwarves settled in the Grey Mountains to the north west.
Thrór 	TA 2590 - TA 2790† 	He returned to the Lonely Mountain following the death of his father Dáin I in TA 2589, he re-founded the Kingdom. In TA 2770 with the coming of Smaug, King Thrór was forced into exile until he was later murdered in Moria by Azog in TA 2790.
Smaug 	TA 2770 - TA 2941 	In TA 2770 Smaug conquered the Lonely Mountain and forced King Thrór and the surviving Dwarves into exile and became the de facto king until his death.
Thráin II 	TA 2790 - TA 2850† 	The son of Thrór, he succeeded his father in TA 2790 as de jure king, and died a prisoner in Dol Guldur in TA 2850.
Thorin II Oakenshield	TA 2850 - TA 2941† 	The son of Thráin II, he succeeded his father in TA 2850 as de jure king. Thorin II Oakenshield was briefly restored to the throne in TA 2941 after the death of Smaug. He was killed shortly afterward in the Battle of Five Armies along with his nephews Fíli and Kíli.
Dáin II Ironfoot 	TA 2941 - TA 3019† 	The son of Náin and second cousin of Thorin II Oakenshield, Dáin II Ironfoot succeeded Thorin II in TA 2941. He died during the Battle of Dale in TA 3019.
Thorin III Stonehelm 	TA 3019 - FO "unknown"	The son of Dáin II Ironfoot, he succeeded his father during the siege of the Lonely Mountain and ruled in the aftermath of the War of the Ring.
Durin VII 	FO "unknown" 	Possibly the son of Thorin III Stonehelm. Led Durin's Folk back to Khazad-dûm.