Ulfast
From Tolkien Gateway
The treacherous son of Ulfang, who professed to follow Caranthir, but who turned on the Sons of Fëanor in the Nirnaeth Arnoediad, and so brought about their defeat.
The treacherous son of Ulfang, who professed to follow Caranthir, but who turned on the Sons of Fëanor in the Nirnaeth Arnoediad, and so brought about their defeat.