A major Byzantine invasion in 1263 led to the loss of the coastal towns Messembria and Anchialus, and several cities in Thrace—including Philippopolis.
Suur Bütsantsi sissetung aastal 1263 viis rannikulinnade Messembria ja Anhialose ning mitme Traakia linna – sealhulgas Philippopolise – kaotamiseni.