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After the end of the First Age the power and wealth of Khazad-dûm was much increased; for it was enriched by many people and much lore and craft when the ancient cities of Nogrod and Belegost in the Blue Mountains were ruined at the breaking of Thangorodrim.
- Appendix A, Durin’s Folk
Guarding one of the only passes over the Blue Mountains, the city of Nogrod was one of the first dwarven dwellings in Middle-earth. After prospering for much of the First Age, the city was heavily damaged in the War of Wrath. This led most of its remaining inhabitants to abandon the city in favor of Khazad-Dûm early in the Second Age.
