Dáin Ironfoot was a lord of the Iron Hills who fought in the Dwarf and Goblin wars where he killed Azog. During the events of the Hobbit, he led an army of dwarves to the aid of Thorin Oakenshield and fought in the Battle of Five Armies. After Thorin's death, Dáin was crowned as king and ruled until the War of the Ring when he was killed in an Easterling attack on Erebor alongside King Brand.
As a result of this, Dáin is recruitable in two dwarven factions. He is the Lord of the Iron Hills for the Iron Hills subfaction and King Under the Mountain for the Erebor subfaction.