Dior (FA 470-509) was the son of Beren and Lúthien, called Aranel (‘Star-king’) during his childhood, and later Eluchíl (‘Thingol’s Heir’). Born on the isle of Tol Galen in Ossiriand, he later made his dwelling at Lanthir Lamath. He wedded Nimloth, a distant kinswoman of Thingol, and she bore him three children: Eluréd, Elurin, and Elwing the White. Dior was said to have been very beautiful, as the blood of the Edain, Eldar, and Maiar flowed in him.
After the slaying of Thingol by the dwarves who coveted the Nauglamír, Dior became the King of Doriath; but just a few years later, when the Sons of Fëanor learned that the Silmaril that was kept there, they waged war upon the kingdom.
Both Dior and Nimloth were slain during the Sack of Menegroth, and Eluréd and Elurín captured and left to die in the woods of Doriath; their daughter, Elwing, survived, and with the remaining Elves of Doriath, escaped to the Havens of Sirion. Here she married Eärendil the Mariner, and they sought the help and pardon of the Valar.