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[1] and his successor and grandson Dáin II Ironfoot[2]. After Dáin became King of Durin's Folk and took up abode in Erebor, it is not known if anyone else then took up the title.

Portrayal in adaptations

2018: The Lord of the Rings Online:

During the reign of Thorin Stonehelm, his brother, "Náin the Slakeless", is Lord of the Iron Hills. He rules from the capital, "Járnfast".