Moria is the home of an ancient Dwarven mithril mine. The Dwarves mined too deeply under the mountains and awakened a great evil. The king was killed and the Dwarves fled. Moria was then left abandoned to Orcs and other evil creatures for a thousand years. Following his adventure to the Lonely Mountain with Bilbo, Balin, son of Fundin, returned to Moria in an attempt to revive the Dwarven colony there. However, the colony only lasted five years.