Dior is the son of Beren and Lúthien. After Thingol is killed by the dwarves of Nogrod, Dior moves to Doriath to rule the Sindar, accompanied by his wife Nimloth and their children Elwing, Eluréd, and Elurín. Dior receives the Silmaril after his parents die, and the sons of Fëanor kill him and destroy Doriath while trying to fulfill their oath and reclaim it.
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Dior Character Timeline in The Silmarillion
The timeline below shows where the character Dior appears in The Silmarillion. The colored dots and icons indicate which themes are associated with that appearance.
Chapter 20. Of the Fifth Battle: Nirnaeth Arnoediad
...of the world. They then travel alone to Ossiriand, where history loses track of them. Dior, their son and Thingol’s heir, is born there.
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Chapter 22. Of the Ruin of Doriath
At that time, Beren and Lúthien still live in Tol Galen in Ossiriand. Their son Dior is married to Nimloth, a relative of Celeborn, and their children are named Eluréd, Elurín...
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...seen outside of Valinor and that Tol Galen becomes fair and fruitful with it there. Dior travels to Menegroth with his wife and children to rule the Sindar. Later, a lord...
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Rumor spreads among the elves of Beleriand that Dior now wears the Silmaril, and the sons of Fëanor plan to attack Doriath and reclaim...
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Chapter 23. Of Tuor and the Fall of Gondolin
...closes the door to the city. After the eagles bring news of the death of Dior, he swears to never ally himself with the sons of Fëanor.
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