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John II Komnenos or Comnenus (Greek: Ιωάννης Β΄ Κομνηνός, Iōannēs II Komnēnos) (September 13, 1087April 8, 1143) was Byzantine emperor from 1118 to 1143. Also known as Kaloïōannēs ("John the Beautiful"), he was the eldest son of emperor Alexios I Komnenos and Irene Doukaina. The second emperor of the Komnenian restoration of the Byzantine Empire, John was a pious and dedicated emperor who was determined to undo the damage his empire had suffered at the battle of Manzikert, half a century earlier.

In the course of his twenty-five year reign, John made alliances with the Holy Roman Empire in the west, decisively defeated the Pechenegs in the Balkans, and personally led numerous campaigns against the Turks in Asia Minor. John's campaigns fundamentally changed the balance of power in the east, forcing the Turks onto the defensive and restoring to the Byzantines many towns, fortresses and cities right across the peninsula. In the southeast, John extended Byzantine control from the Maeander in the west all the way to Cilicia and Tarsus in the east. In an effort to demonstrate the Byzantine emperor's role as the leader of the Christian world, John marched into the Holy Land at the head of the combined forces of Byzantium and the Crusader states; yet despite the great vigour with which he pressed the campaign, John's hopes were disappointed by the treachery of his Crusader allies, who deliberately failed to fight against the Muslim enemy at the crucial moment. (Read more...)