Talk:Princess Cadance/@comment-74.100.19.205-20120414193933/@comment-29050-20120414235232

The monarchy of Equestria constitutes that the ruler is a princess, or a couple of princesses, depending on the context, but anyway, the ruler should be addressed as a princess, even though she may act more like a queen.

In other words, Celestia is an active queen of Equestria, but she is called "princess" because that's how things seem to work out with these Ponies.