In the Return of the King book, Aragorn finds the "bones of a mighty man". Clad in mail, a gilded hauberk, and a gold belt and crown. Aragorn then says "Nine mounds and seven there are now green with grass, and through all the long years he has lain at the door he could not unlock. Whither does it lead? Why should he pass? None shall ever know!"
Does anyone know who this person is? I feel like it was a King of Rohan as Aragorn mentions simbelmyne.