Born in 2552 of the Third Age to Dain I, Fror had two brothers named Thror and Gror. Fror's father was King of Durin's Folk. In 2589, Fror and his father were killed by a dragon from the Northern Waste called a Cold-drake. Dwarves abandoned the Grey Mountains soon after their deaths.
The Lord of the Rings, Appendix A: "Durin's Folk," page 353
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