Elf, Son of Aredhel of Gondolin and Eöl the Dark Elf.
Secretly called Lómion by his mother Aredhel in defiance of Eöl's ban on the tongue of the Noldor.
Maeglin came to Gondolin with his mother and was accepted as Turgon's Sister son. Maeglin was in love with his cousin Idril.
Maeglin betrayed Gondolin to Morgoth.
The "Fall of Gondolin" would have been Tolkien's greatest work, but he would have needed an elven lifespan to write it all.
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