There Melian came, the Lady grey,
and dark and long her tresses lay,
beneath her silver girdle seat
and down unto her silver feet.
She is a Maia of the race of the Ainur, akin to Yavanna. Before the First Age, in the Years of the Trees, she left the gardens of Lórien and went to Middle-earth, and there she fell in love with the Elven-king Elu Thingol, King Greymantle, and with him ruled the kingdom of Doriath. She had a child with Thingol, a daughter named Lúthien, said to be the fairest and most beautiful of all the Children of Ilúvatar. Melian's line of descent is the half-elven and Kings of Númenor.
Thingol encountered Melian in the woods of Nan Elmoth and fell under Melian's enchantment of love for long, long years. As a result of his absence a portion of his followers stayed behind to search for him; the rest continued on to Valinor.Melian and Thingol thereafter founded the kingdom of Doriath in Middle-earth. Their daughter Lúthien Tinúviel married the Man Beren. As a result Melian's Maian blood passed to both Elves and Men.
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