Elves of Mithrim
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The Elves of Mithrim crossed the Ered Wethrin from Beleriand at some time before the rising of the Sun. They were the first Elves of Middle-earth to encounter the Noldor upon their return from Aman. Fingolfin took up lordship in Hithlum, with most of his own people dwelling around the shores of Lake Mithrim, and there was presumably a degree of intermingling between the two peoples. It is not stated to what extent the Grey-elves of Mithrim participated in the Wars of Beleriand under Fingolfin and Fingon, but after Nirnaeth Arnoediad they sheltered Rían. Annael, an Elf of Mithrim, fostered her son Tuor after she departed Hithlum.