He's to self-centered, why should he rule some kingdom? Cadence is KIND. Not like that stuck up BB. That was just Rarity's IMAGINATION about him being Celestia's nephew. And if he was, would that mean there is another royal sister? And if he did rule some land, it would be the stupid land where all the ponies are self-centered. He must of had a cruel filly-hood if he acts like that, but one time he DID worship Rarity. Episode 9 Season 2, he is there smiling at Rarity during the song.
He would NOT be one of the most popular ponies in the Fandom. That is STUPID. What does Cadence have to do with any of this?
Cadence is NICE. NICE, NICE, NICE. Not self-centered.
Yet that is probably a FanFiction which is not real, Celestia is not his aunt unless Luna had a child or they have another sister or brother.
------
Oh and Prince's and Princess's are ALICORN'S, so how is he a Prince? Shining Armour became a Prince when he married Cadence so no he is not an 'Prince'.