Characters in The Book of Lost Tales

Eriol

An English mariner who finds the Lonely Isle and hears the earliest versions of the Elvish legends — the framing device that holds the collection together.

Morgoth

Appears in an earlier, less cosmic form than in The Silmarillion; still recognisable as the primary villain but rooted in a different mythological register.

Also in The Lays of Beleriand, The Shaping of Middle-earth, Morgoth’s Ring, The War of the Jewels