Rían, daughter of Belegund, was the wife of Huor, son of Galdor; and she was wedded to him two months before he went with Húrin his brother to the Nirnaeth Arnoediad. When no tidings came of her lord she fled into the wild; but she was aided by the Grey-elves of Mithrim, and when her son Tuor was born they fostered him. Then Rían departed from Hithlum, and going to the Haudh-en-Ndengin she laid herself down upon it and died."
"Tuor was taken to foster by Annael of the Grey-elves, who yet lived in those hills. Now when Tuor was sixteen years old the Elves were minded to leave the caves of Androth where they dwelt, and to make their way secretly to the Havens of Sirion in the distant south; but they were assailed by Orcs and Easterlings before they made good their escape, and Tuor was taken captive and enslaved by Lorgan, chief of the Easterlings of Hithlum. For three years he endured that thraldom, but at the end of that time he escaped; and returning to the caves of Androth he dwelt there alone, and did such great hurt to the Easterlings that Lorgan set a price upon his head. The Silmarillion (chapter 21 & 23)