The alicorn pony is a pegasus and unicorn mixed together.as far as we know they are not born, but made. Princes Celestia and princes luna were assumbably the first alicorn. I belive this happend upon defeating Discord over 1000 years ago. Its still being questiond as to why both princeses are immortal, according to bronycurious (a youtube and blog poster) they're immortal because they control the day and night which must forever be turning...a thought i highly agree with. But back to the main topic, alicorns. PC and PL were the first and the rarity of them was gone when princes candice became one and added to the extintion of rarity when twilight sparkle joined the race.
felling brave? if so, leave a comment on your thought!