The pony capital? · 9:49pm Jan 7th, 2013
I just realised something.
In most fics that deal with Equestrian history (or at least most fics I came across) it is assumed, that the Castle of the Royal Pony sisters was the former capital and a place were the court resided. Then Luna went NMM, and the batle ruined once glorious city, so Celly moved her seat of power to a new place: Canterlot.