Kingdom under the Mountain
The Kingdom under the Mountain was the name given to the Dwarf realm of Erebor. It was founded in T.A. 1990 when Thráin I came to the Lonely Mountain and discoverd the Arkenstone. The kingdom lasted until 2770 when Smaug the Dragon invaded and either killed the Dwarves or forced them to leave. When Smaug was slain in 2941, Dáin Ironfoot became King Dáin II and the kingdom was restored.