Tuhia he tohutoro mō tēnei wāhanga - Te Whakatū o Asen rāua ko Pita
I tiimata i te 26 o Oketopa 1185, te ra hakari o St. Demetrius o Thessaloniki, ka mutu me te whakaoranga o Bulgaria me te hanganga o te Emepaea Tuarua o Bulgaria, i whakahaerehia e te Asen dynasty.