伊萨克二世
In 1185, Andronicus I was killed in Constantinople and the new Byzantine emperor Isaac II Angelos began peace negotiations with the Hungarian king. The peace treaty provided for Emperor Isaac II to marry Bela's daughter Margaret. The Hungarian army withdrew from the Byzantine central part of the Balkans, leaving Nemanja without support. Fortunately for Nemanja, at the same time, the Normans and the Bulgarians joined the anti-Byzantine alliance.