安德洛尼卡一世
In 1182, King Bela of Hungary attacked the Byzantine fortresses of Belgrade and Braničevo. The war continued in 1183, when the Serbs joined forces with the Hungarians. The Byzantine border armies were under the command of two experienced commanders: Alexios Branas and Andronikos Lapardas. The news that Andronikos I Komnenos had taken power in Constantinople divided the two commanders, so they retreated towards Trajan's Gate.