Twilight Sparkle, ever-loyal student of Princess Celestia and well taught in the magical arts, has kindly offered to move to the backwater town of Ponyville in order to make friends, discover new things and learn something about herself. She has generously paid all the fees, answered all the customs questions with absolute honesty and is looking forward to starting a new chapter in her life.

Depressingly, nopony else is.

Once upon a time, in the land of Equestria, there lived an innocent alicorn pegasus filly by the name of Princess Erroria Alula.

The only problem is, nopony knows where she comes from, or who her parents are, or why she's an alicorn but nearly everypony else is not. She is definitely normal and is not going to save Equestria from certain doom or anything.

Error's Alula's also missing a cutie mark. So she's going to get one.

While saving Equestria, of course. While being a completely normal everyday pony, of course.

Derives from canon, around about the time of Call of the Cutie. Princess Erroria is due to an animation error and nothing more.