Galadriel was the co-ruler and Lady of Lothlorien along with her husband, Lord Celeborn. Neither she nor Celeborn took royal titles as they saw themselves as guardians of Lothlorien.
She was the only daughter and youngest child of Finarfin, prince of the Noldor and of Earwen, whose cousin was Luthien. Her elder brothers were Finrod Felegund, Angrod, and Aegnor. Galadriel was a niece of Feanor, one of the most important elves of the First age.
She was one of the greatest of the Eldar in Middle-earth, and surpassed nearly all others in beauty, knowledge, and power. She was also the bearer of Nenya, one of the three Elven rings. Tolkien thought of her, along with Gil-galad the Elven-king, as one of the mightiest and fairest of all the Elves left in Middle-earth.
