I believe that you're talking about the Finnish epic Kalevala. Tolkien got the names of the Dwarves in The Hobbit from the Kalevala, among other things.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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