Dwarves abandon the Grey Mountains
Event Type: Cultural/Social
Age: 3rd Age - The Stewards
Thrór returns to Erebor. Grór his brother goes to the Iron Hills.
The Return of the King, LoTR Appendix B, The Tale of Years: The Third Age
... [The dragons] became strong again and multiplied, and they made war on the dwarves, and plundered their works. At last Dáin I, together with Frór his second son, was slain at the door of his hall by a great cold-drake.
Not long after most of Durin's Folk abandoned the Grey Mountains.
The Return of the King, LoTR Appendix A, Annals of the Kings and Rulers: Durin's Folk
[Said Thorin,] 'Long ago in my grandfather Thrór's time our family was driven out of the far North, and came back with all their wealth and their tools to this Mountain on the map.
The Hobbit, Ch 1, An Unexpected Party
Elena Tiriel 8Oct05