The fall of Gondolin

"In the Tale of The Fall of Gondolin are two of the greatest powers in the world. There is Morgoth of the uttermost evil, unseen in this story but ruling over a vast military power from his fortress of Angband. Deeply opposed to Morgoth is Ulmo, second in might only to Manw?, chief of the Valar: he is called the Lord of Waters, of all seas, lakes, and rivers under the sky"--Amazon.com.