According to The Silmarillion, Elu Thingol was not counted among the Moriquendi, although he was king of the Moriquendi of Beleriand; for he had seen the light of the Trees in Valinor.
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There existed two old elvish compounds in the Quenderin language, Primitive Quendian with *kwendī "Elves": *kala-kwendī and *mori-kwendī, meaning the "Light-folk" and the "Dark-folk".