Grór was a dwarf of Durins House the youngest of the three sons of Dáin I. When Grór was twenty-six years old, a cold-drake killed the King along with his second son, Frór.

The two remaining brothers decided to flee from the Ered Mithrin with their people and settle elsewhere. Thrór led his people back to Erebor while Grór travelled to the Iron Hills, where he founded a realm of his own.

His son, Náin III, was killed at the Battle of Nanduhirion, and Grór's successor was his grandson Dáin II.
Encyclopedia entry originally written by atalante_star