at first his own people did not know gwindor , who went out young and strong , and returned now seeming as one of the aged among mortal men , because of his torments and his labours ; but finduilas daughter of orodreth the king knew him and welcomed him , for she had loved him before the nirnaeth , and so greatly did gwindor love her beauty that he named her faelivrin , which is the gleam of the sun on the pools of ivrin .