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The first rulers of the region of the Mouths of Sirion, also known as Arvernien, were Tuor of the Edain and Idril of Gondolin. Later their son Eärendil Half-Elven, married the Half-Elven Elwing, Dior's daughter and survivor of the Sack of Doriath. Elros and Elrond, the sons of Eärendil and Elwing, were born in Arvernien.