Beren was a mortal man, but Lúthien was an immortal elf. Her father, a great elvish lord, in deep opposition to Beren, imposed on him an impossible task that he must perform before he might wed Lúthien. This leads to the supremely heroic attempt of Beren and Lúthien together to rob the greatest of all evil beings, Melkor, called Morgoth, the Black Enemy, of a Silmaril.
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