who became king under the mountain when thorin died

It is said that Dain was a “great and wise” leader and though details are scant, it is said that had not Dain and King Brand stood in his path, Sauron may have been able to stretch his arm north and cause great destruction. The Dwarves and men of Dale were a strong presence that secured the north of Middle-earth, leaving the War of the Ring and Sauron more to the south around Mordor and taking the Great Dragon out of play. Soon after the battle, his status was elevated to King Under The Mountain, giving Dwarves a mighty presence and fortress as Gandalf desired. It is likely most of the Dwarf soldiers on the field were grizzled vets of the previous Orc war and would have been experienced survivors and killers. The events told in ‘The Hobbit’ concern chiefly Thorin but Dain enters the story when, after receiving a message from a bird, led his folk to again bleed for his people at the Battle of Five Armies to once again fight goblins, including Bolg, the son of Azog. After burning the great number of dead and leaving no armor or weapons behind for Orc scavengers, Dain, who saw that a Balrog of Morgoth lurked within, led his folk back to the Iron Hills, leaving Thrain and Thorin Oakenshield behind with the head of Azog. The young Dain became the lord of the Dwarves in the Iron Hills in the north regions of Middle-earth, declining to enter Moria after the battle with the Goblins. Azog was infamous for acts of desecration of the body of Thror after killing him in Moria (which in fact precipitated the whole war in the dark places of Middle-earth) and so Dain’s feat was a great triumph for his people who sought revenge and not treasure.

Dain, a stripling barely old enough for battle caught the chief as he was nearly on the threshold of Moria and hewed off the goblin’s head with his red ax in the Battle of Azanulbizar. In a war between the Dwarves and the Orcs, when the Dwarf armies had marched to the gates of Khazad-dum, Dain’s father Nain, fatigued by battle, was killed by the great goblin Azog. Dain, actually named Dain II Ironfoot, was one of the great Dwarves of his age or perhaps any age and was an important figure in The War of the Ring, although much less heralded in the histories of Elves, Men and Hobbits.

Who became king under the mountain when thorin died