§ Of Tuor and the Fall of Gondolin The Silmarillion

And Tuor remained in Gondolin, for its bliss and its beauty and the wisdom of its people held mm enthralled; and he became mighty in stature and in mind, and learned deeply of the lore of the exiled Elves. Then the heart of Idril was turned to him, and his to her; and Maeglin's secret hatred grew ever greater, for he desired above all things to possess her, the only heir of the King of Gondolin. But so high did Tuor stand in the favour of the King that when he had dwelt there for seven years Turgon did not refuse him even the hand of his daughter; for though he would not heed the bidding of Ulmo, he perceived that the fate of the Noldor was wound with the one whom Ulmo had sent; and he did not forget the words that Huor spoke to him before the host of Gondolin departed from the Battle of Unnumbered Tears.