§ Of the Silmarils and the Unrest of the Noldor The Silmarillion

With him into banishment went his seven sons, and northward in Valinor they made a strong place and treasury in the hills; and there at Formenos a multitude of gems were laid in hoard, and weapons also, and the Silmarils were shut in a chamber of iron. Thither also came Finwë the King, because of the love that he bore to Fëanor; and Fingolfin ruled the Noldor in Tirion. Thus the lies of Melkor were made true in seeming, though Fëanor by his own deeds had brought this thing to pass; and the bitterness that Melkor had sown endured, and lived still long afterwards between the sons of Fingolfin and Fëanor.