John II Komnenos

John II Komnenos (1087–1143), the Good (Kaloïōannēs), was Byzantine emperor from 1118 to 1143 and the eldest son of Alexios I. Crowned co-emperor in 1092, he married the Hungarian princess Piroska, renamed Irene, in 1104, sealing an alliance that strengthened Byzantium in the Balkans.

In a quarter-century of campaigns he defeated the Pechenegs, Hungarians and Serbs in the Balkans, allied with the Holy Roman Empire, drove the Turks back across Anatolia and campaigned in Syria beside unreliable Crusader allies. Preparing another move on Antioch, he died of a hunting wound in Cilicia in 1143, leaving the throne to his younger son Manuel.