Lord of the Iron Hills
From Tolkien Gateway
Lord of the Iron Hills was a title given to the rulers of the Iron Hills in eastern Wilderland. The only two known Dwarves to bear this title were Grór and his successor and grandson Dáin II Ironfoot. After Dáin became King of Durin's Folk and took up abode in Erebor, it is not know if anyone else then took up the title.