Talk:Princess Celestia/@comment-7345250-20131011023012/@comment-4143277-20131012112818

Celestia and Luna are joint rulers, thus their rule is probably equal - other means of ascension to alicorn such as Cadance and Twilight also hold the name "Princess". I doubt there's any higher power than Celestia and Luna, except maybe their creators/parents but the Princess title seems the highest possible one out there.