Narthseg was an Elf of Doriath who betrayed the secret entry into his kingom to the vengueful Dwarves of Nogrod.
Speculations[]
In the Book of Lost Tales Narthseg is considered a Gnome, but he should perhaps be revised as a Noldo of the Mole-kin or maybe even more likely an Avar of the Eölrim.
