EreborErebor - After the Balrog was loosed upon Moria, the Dwarves fled from there and made for themselves a new home in the Lonely Mountain.

 

"Most of these that escaped made their way into the North, and Thráin I, Náin's son, came to Erebor, the Lonely Mountain, near the eastern caves of Mirkwood, and there he began new works, and became King under the Mountain." ~The Return of the King (Appendix A)