Hungary's defeat in the Byzantine war

Timeline

1. 1164–1166Croatia-Dalmatia border · CroatiaHungary and Byzantium fought a prolonged conflict over suzerainty in Croatia and control of Dalmatian ports; Hungarian forces gradually lost ground in the border seesaw and could not prevent Byzantium from restoring its influence on the eastern Adriatic coast.
2. 1167Sirmium · SerbiaHungary's main army was annihilated at Sirmium by a coalition force commanded by the Byzantine general Andronikos Kontostephanos; Stephen III was forced to accept a humiliating peace, ceding territory and recognizing Byzantine suzerainty, dealing a heavy blow to Hungary's ambitions for hegemony in Southeast Europe.