Talk:The Crystalling - Part 1/@comment-4531200-20160326191320/@comment-1031724-20160328003148

"Something Equestria has never seen..."

That actually makes sense. Besides, they were probably around before the founding of Equestria. In the book Luna mentions being educated by other alicorns on the Royal Canterlot Voice, but maybe the other alicorns stayed where they were when Celestia and Luna became rulers of Equestria. I'm not 100% sure on how Celestia has a neice and nephew, but the birth of an alicorn was obviously never seen in Equestria from the moment they took over to this episode. The only other alicorns there are Cadance and Twilight, and Crystal Heart Spell or not, this episode confirms that Cadance was turned into an alicorn from what she originally was. (Crystal Heart Spell says pegasus)