TOLKIEN HAD THE WORDS FOR IT: 14 THE FALL OF GONDOLIN

Now came days when Tuor had dwelt among the Gondothlim many years. Long had he known and cherished a love for the king's daughter, and now was his heart full of that love. Great love too had Idril for Tuor, and the strands of her fate were woven with his even from that day when first she gazed upon him from a high window as he stood a way-worn suppliant before the palace of the king. Little cause had Turgon to withstand their love, for he saw in Tuor a kinsman of comfort and great hope. Thus was first wed a child of Men with a daughter of Elfinesse, nor was Tuor the last. Less bliss have many had than they, and their sorrow in the end was great. Yet great was the mirth of those days when Idril and
Tuor were wed before the folk in Gar Ainion, the Place of the Gods, nigh to the king's halls. A day of merriment was that wedding to the city of Gondolin, and of the greatest happiness to Tuor and Idril. Thereafter dwelt they in joy in that house upon the walls that looked out south over Tumladin, and this was good to the hearts of all in the city save Meglin alone.

The Book of Lost tales Part 2