She is an Alicorn pony, co-ruler of Equestria alongside her younger sister, Princess Luna, and adoptive aunt of Princess Cadance. In addition to her responsibility of creating the sun, she is also the teacher of Twilight Sparkle and Sunset Shimmer at different times, often referring to Twilight as "my faithful student" while mentoring her. She has a pet phoenix named Philomena. An immortal alicorn, she is responsible for raising the sun each day. Celestia ruled Equestria for over thousand years.