Quenta Silmarillion: The History of the Silmarils, Chapter 15: Of the Noldor in Beleriand and Chapter 16: Of Maeglin Summary

Turgon secretly builds Gondolin in the hidden vale, but Ulmo warns him of the Doom of Mandos. Galadriel tells Melian about the Silmarils and Feanor's vengeance and warns Thingol against trusting the sons of Feanor too much. Due to Morgoth's rumors, King Thingol chides Finrod for the kinslaying of the Teleri, and Thingol banishes them temporarily. Turgon's sister, Aredhel, grows bored of Gondolin and wants to leave. Turgon agrees that she may go to Fingon in Hithlum, but when she departs, she decides to seek the sons of Feanor. Thingol will not allow her to pass through the girdle, and Aredhel gets separated from her escorts who return to Gondolin. Aredhel...