Naugladur
From Tolkien Gateway
Naugladur was the king of the dwarves of Nogrod. He led the attack against and killed Elu Thingol to capture the Nauglamír. Later he fought with Beren in the Battle of Sarn Athrad and would have slain him, but stumbled and Beren slew him to reclaim the Nauglamír.
He is not mentioned by name in The Silmarillion, but his name was revealed in The History of Middle-earth books.
