The Princesses have been ruling over Equestria ever since Pony History was recorded. Nopony knows why the Alicorns live so long, and they don't even know why there's only two of them. However, as the year comes to an end, Celestia has holed herself up in her palace's far tower and hasn't let anypony see her. The only notice of Celestia's appearence is the last letter she sent to Twilight Sparkle asking her to visit her in said tower. (My fail attempt at a Dark FanFic)