Galadriel was the co-ruler and Lady of Lothlórien along with her husband, Lord Celeborn. Neither she nor Celeborn took royal titles as they saw themselves as guardians of Lothlorien.
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.
“Galadriel is for me the symbol of eternal female strength and beauty.”