Bórin of Dúrin's Folk

A Dwarf of Durin's line, Borin lived with the community in the Grey Mountains until T.A. 2590, when he joined Thror (his nephew) in Erebor, where the magnificent Arkenstone was held. Treasured as "The-Heart-of-the-Mountain," the great gem was lost in Smaug's attack in T.A, 2770 and later recovered by Bilbo Baggins in 2941, after the demise of the golden Dragon.

Borin lived from T.A. 2450 until T.A. 2711.