Náin was the grandson of King Dáin I of Durin's Folk, the son of Dáin's youngest son Grór, and the father of Dáin Ironfoot. Náin was slain at the Battle of Azanulbizar. After Náin's death the lines of Grór's two elder brothers failed, and Náin's son Dáin Ironfoot became King.
War of the Dwarves and OrcsEdit
Náin was one of the Dwarves who took part in the War of the Dwarves and Orcs around TA 2790 - TA 2793. During the Battle of Azanulbizar in TA 2799, Náin turned the tide of battle when he led a fresh army of Dwarves, who drove through the host of Orcs up to the East-Gate of Moria. Náin stood before the Gate, and in his wrath he cried with a great voice for Azog to come out and face him. Finally Azog appeared, fresh and fully armed, and the two fought. Náin withstood Azog's assault until, blinded by his great rage, he swung a great stroke with all his strength at Azog. The Orc chief dodged the blow and kicked Náin’s leg, causing him to fall forward. Náin's mattock splintered on a nearby stone, and Azog's return swing broke Náin's neck, killing him.
Azog didn't have long to celebrate his slaying of the great Dwarf, as his host was in the midst of a great rout. Then, as he attempted to re-enter Moria, the young Dáin Ironfoot leaped up the steps and with his red axe decapitated Azog, avenging his father’s death. Náin’s body was cremated on great wooden pyres along with the other Dwarves who had fallen in the battle. Náin and the Dwarves who were cremated with him that day were afterward known as the Burned Dwarves of Azanulbizar.