Born in TA 2762, Ratlin was a friend of Thorin Oakenshield and Balin. He was a commander of a 200 Elite Dwarven Army. He witnessed the mining of Arkenstone with Thorin Oakenshield, Balin, Brædfætmann and Tok the miner. In the Battle of Azanulbizar, he followed Thorin's banner and attacked. Later, half of his army was perished and he decided to raid Azog with Thrain, Thorin's father. He is the only one of his army who survived the charge.