Fillydelphia is briefly mentioned by Princess Celestia in the episode Swarm of the Century. As an excuse for cancelling her visit to Ponyville, the Princess says she has to go to Fillydelphia in order to deal with an infestation of "incredibly bothersome creatures", presumably parasprites. It is also mentioned in A Friend in Deed as Cranky Doodle Donkey's previous residence. In It's About Time, it is mentioned when Rainbow Dash gives the report that nothing dangerous is coming from Fillydelphia all the way to Las Pegasus. In Hurricane Fluttershy, Rainbow Dash mentions that Fillydelphia broke the tornado wind speed record with a top speed of 910 wingpower. Lauren Faust, the show's creator, mentioned in a comment on deviantArt that she wanted to name the main setting of the show Fillydelphia after Philadelphia where her family resides, but ultimately went with Ponyville.
