The Lord of the Waters by khorazir
Then Tuor bowed in reverence, for it seemed to him that he beheld a mighty king. A tall crown he wore like silver, from which his long hair fell down as foam glimmering in the dusk; and as he cast back the grey mantle that hung about him like a mist, behold! he was clad in a gleaming coat, close-fitted as the mail of a mighty fish, and in a kirtle of deep green that flashed and flickered with sea-fire as he strode slowly towards the land. In this manner the Dweller of the Deep, whom the Noldor name Ulmo, Lord of Waters, showed himself to Tuor son of Huor of the House of Hador beneath Vinyamar.
J.R.R. Tolkien: "Unfinished Tales": Of Tuor and his coming to Gondolin