most of the Noldor to pursue Melkor, whom Fëanor renamed Morgoth, to Middle-earth. Fëanor's sons seized ships from the Teleri, killing many of them, and betrayed others of the Noldor, leaving them to make a perilous passage on foot across the dangerous ice of the Helcaraxe. Upon arriving in Middle-earth, the Noldor defeated Melkor's army, though Fëanor was killed by Balrogs. After a period of peace, Melkor attacked the Noldor but was placed in a tight siege, which held for nearly 400 years. The Noldor built up kingdoms throughout Beleriand. Fëanor's firstborn Maedhros wisely chose to live in the east away from the rest of their kin, knowing that they would easily be provoked into war if they lived too close to their kinsmen. Fingolfin and his eldest son Fingon lived in the northwest. Fingolfin's second son Turgon and Turgon's cousin Finrod built hidden kingdoms, after receiving visions from the Vala Ulmo. Finrod hewed cave dwellings which became the realm of Nargothrond, while Turgon discovered a hidden vale surrounded by mountains, and chose that to build the city of Gondolin. Because of the secrecy of the Elvish cities of Beleriand, they were more secure from Melkor's armies. Turgon took great care to keep Gondolin secret, and it was one of the last Elven strongholds to fall. After the destruction of the Trees and the theft of the Silmarils, the Valar created the moon and the sun; they were carried across the sky in ships. At the same time, Men awoke; some later arrived in Beleriand and allied themselves to the Elves. Beren, a Man who survived the latest battle, wandered into Doriath, where he fell in love with the Elf maiden Lúthien, daughter of Thingol and Melian. Thingol believed no mere Man was worthy of his daughter, and set a seemingly impossible price for her hand: one of the Silmarils. Undaunted, Beren set out, and Lúthien joined him, though he tried to dissuade her. Sauron, a powerful servant of Melkor, imprisoned Beren, but with Lúthien's help, he escaped. Together, they entered Melkor's fortress and stole a Silmaril from his crown. Amazed, Thingol accepted Beren, and the first union of Man and Elf occurred, though Beren was soon mortally wounded and Lúthien died of grief. Though the fates of Man and Elf after death would sunder them forever, she persuaded the Vala Mandos to make an exception for them. He gave