§ Of the Ruin of Doriath The Silmarillion

It is told that a seer and harp-player of Brethil named Glirhuin made a song, saying that the Stone of the Hapless should not be defiled by Morgoth nor ever thrown down, not though the sea should drown all the land; as after indeed befell, and still Tol Morwen stands alone in the water beyond the new coasts that were made in the days of the wrath of the Valar. But Húrin does not lie there, for his doom drove him on, and the Shadow still followed him.