"King of Durin's Folk" was the title given to the head of Dwarven clan of Durin's Folk (or "Longbeards").

The first of these rulers were inhabitants of Khazad-dûm long descended from Durin. They ruled and lived there for thousands of years until TA 1980 when miners awoke a Balrog which eventually drove out the Dwarves.

Afterwards, its successors lived elsewhere and founded other kingdoms such as places like Lonely Mountain (Erebor), the Grey Mountains (Ered Mithrin), and the Blue Mountains (Ered Luin).

Kings of Durin's Folk (Years of the Trees - Fourth Age)
Ruling from Khazad-dûm
Durin I, the Deathless Years of the Trees - First Age One of the seven Fathers of the Dwarves and founder of the Longbeards, Durin's Folk. He ruled his people for centuries - so long, in fact, that he became known as the 'Durin the Deathless' - but eventually he died during the First Age. He discovered the caves of Khazad-dûm and began his reign there.
Durin II Unknown - Unknown He was known to be in alliance with Men of the Vales of Anduin.
Durin III Unknown - Unknown

He was the King of Khazad-dûm at the time of the forging of the Rings of Power (sometime between S.A. 1500 and 1590) and a great friend of Celebrimbor the Lord of Eregion to the west. He received one of the Rings (later known as the Ring of Thrór) as a gift from his friend.

Durin IV Late Second Age - Likely early Third Age He was the king during the War of the Last Alliance, and he sent a massive army to fight alongside the Last Alliance of Elves and Men.
Durin V Unknown - Unknown With one of the seven Dwarven rings his kingdom prospered.
Durin VI TA 1731 - TA 1980He was king when the Balrog was awakened in 1980. After he was killed by it the Balrog was called Durin's Bane and Khazad-dûm was known as Moria.
Náin I TA 1980 - TA 1981He reigned for just one year before was also slain by Durin's Bane.
Ruling from Khazad-dûm & Erebor (1st Kingdom)
Thráin I TA 1981 – TA 2190 He led a great part of his people away from Khazad-dûm into the north and east of Middle-earth and founded the Kingdom under the Mountain in 1999.
Ruling from the Grey Mountains
Thorin I TA 2190 – TA 2289 Learning that his people were regrouping in the Grey Mountains, Thorin I abandoned Erebor and reestablished the throne in the Ered Mithrin in 2210.
Glóin TA 2289 – TA 2385 He expanded the mines of the Ered Mithrin, and further abandoned Erebor.
Óin TA 2385 - TA 2488 Towards the very end of Óin's reign, in T.A. 2460, the Shadow returned to Dol Guldur in Mirkwood with increased strength; and in c. T.A. 2480 Orcs began to spread again in the Misty Mountains in order to block all passes into Eriador, whilst Sauron's creatures took Moria as their own.
Náin II TA 2488 - TA 2585 In 2570, the prosperous Dwarves began to suffer attacks by the dragons of the north.
Dáin I TA 2585 – TA 2589His short reign came to a swift end when he was slain by a cold-drake before the entrance to his halls. He was succeeded by his son.
Ruling from Erebor (2nd Kingdom) and Dunland
Thrór TA 2589 - TA 2790He led his people out of the dragon-infested north back to the Lonely Mountain. He had been King under the Mountain for more than 180 years when the dragon Smaug descended on the mountain and sacked it. He escaped the destruction, and went wandering in the wild before settling in Dunland. Later, went to reclaim Khazad-dûm where he was murdered by Azog the Orc, a crime that provoked the War of the Dwarves and Orcs.
Ruling from Dunland and the Blue Mountains
Thráin II TA 2790 – TA 2850He avenged his father's death with the defeat of Azog's Orcs at the Battle of Azanulbizar. In the early part of his reign, he dwelt in Dunland, but he later moved northwest to the Ered Luin west of Eriador and established a new realm. Before his reign ended, he resolved to return to Erebor, but while wandering in the wild he was captured in 2845 and died in the dungeons of the Necromancer.
Ruling from the Blue Mountains & from Erebor (3rd Kingdom)
Thorin II Oakenshield TA 2850 – TA 2941He ruled as King in the Ered Luin for many years, but like his father before him he determined to return to his ancient home of Erebor. Accompanied by Gandalf and Bilbo Baggins, he led a troop of companions into the east, and against all hope recovered the Lonely Mountain from Smaug. After Smaug's death, Thorin was slain in the Battle of Five Armies. The only remaining descendants of Thrór's line, Thorin's nephews Fíli and Kíli, were also lost in the battle. So the Kingship passed to the line of Thrór's younger brother Grór, and specifically to his grandson Dáin Ironfoot.
Dáin II Ironfoot TA 2941 – TA 3019He ruled in prosperity as King under the Mountain for many years until the time of the War of the Ring. He was slain in the Battle of Dale.
Thorin III Stonehelm TA 3019 - Early Fourth Age He was besieged in Erebor after the loss of his father, but when news reached the forces of Sauron that their master had been defeated, he was able to drive them back. With Thorin III, detailed records of the reigns of the Kings come to an end, but there is a record of just one of his descendants.
Ruling from Khazad-dûm (Kingdom Restored)
Durin VII, the Last Unknown - Unknown Was the last supposed incarnation of Durin I, and led his people back to Khazad dûm where he reestablished the throne of Durin.

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