“In T.A. 2989 Balin left Erebor and entered Moria with a company of dwarves including Flói, Óin, Ori, Frár, Lóni, and Náli. He discovered Durin’s Axe. Balin’s colony was overrun by orcs soon afterward, and Balin was killed by an orc archer in the Dimrill Dale in 2994.
“Ori was one of the twelve companions of Thorin and Bilbo on the Quest of Erebor, and brother to Dori and Nori. He was also one of the Dwarves who entered Moria with Balin. He wears a grey hood, and loves the arts. He was among the last members of Balin’s colony to be killed, as is known by his entering the last records in the Book of Mazarbul before their final hopeless stand against the Orcs. This book was later discovered by the Fellowship of the Ring.”