A long-lived King of Durin's Folk, Thrór ruled his exiled Folk for over 200 years, until T.A. 2790. In T.A. 2590, Thror led the way from the Grey Mountains, where Dragons threatened their existence. Smaug drove him and his followers from Erebor in T.A. 2770; twenty years later, Thror retained to Khazad-dûm, where he was slain and mutilated by Azog and Company, igniting the War between the Dwarves and the Orcs. His map of the Lonely Mountain later helped Gandalf and Bilbo and the Dwarves in their quest to defeat Smaug and to reoccupy Erebor.
- MERP:The Grey Mountains
- MERP:Lords of Middle-earth Vol III: Hobbits, Dwarves, Ents, Orcs & Trolls
- MERP:Middle-Earth Adventure Guidebook II