§ Of the Valar The Silmarillion

Námo the elder dwells in Mandos, which is westward in Valinor. He is the keeper of the Houses of the Dead, and the summoner of the spirits of the slain. He forgets nothing; and he knows all things that shall be, save only those that lie still in the freedom of Ilúvatar. He is the Doomsman of the Valar; but he pronounces his dooms and his Judgements only at the bidding of Manwë. Vairë the Weaver is his spouse, who weaves all things that have ever been in Time into her storied webs, and the halls of Mandos that ever widen as the ages pass are clothed with them.