BoLT 1 does not say of which race Langon is, but it
might take a Maia to
face all those angry Valar. A Man is possible such as the Mouth of
Sauron was, but an Elf is highly unlikely.
April 20, 2004
Langon- Servant of Melko (Melkor) who was sent to
speak with the Valar when they arrived at Melko's gate.
Reference : Book of Lost Tales volume 1, The Chaining of Melko