The daughter of King Thingol and Melian the Maia, who after the fulfilment of the Quest of the Silmaril and the death of Beren chose to become mortal and to share his fate.

In the fictional Battle Tech universe, Luthien (The Black Pearl) is the capital world of the . Luthien is a heavily industrialized world that is traditionally the seat of power for the ruling family of the , House Kurita. It remained relatively untouched during the succession wars, but during the Clan invasion (specifically year 3052) Luthien was invaded by Clan Smoke Jaguar and Clan Nova Cat.