A hidden Elven city of the First Age, founded by Turgon of the Noldor in a secret mountain valley in Beleriand. The most beautiful and enduring of the Noldorin realms, Gondolin was concealed from Morgoth for centuries. Its fall, brought about by betrayal, is one of the great tragedies of the Elder Days. Among the survivors were Tuor and Idril, whose son Eärendil would eventually bring the Valar's aid to Middle-earth.