Chaka Bey

Chaka Bey (Turkish: Çaka Bey; Medieval Greek: Τζαχάς) was an 11th-century Seljuk military commander of Oghuz Turk origin who ruled a vassal state of the Seljuks based in Smyrna (present-day Izmir). Originally in Byzantine service, he rebelled and seized Smyrna, much of the Aegean coastlands of Asia Minor and the islands lying off shore in 1088–91. At the peak of his power, he even declared himself as the Byzantine Emperor, and sought to assault Constantinople in conjunction with the Pechenegs. In 1092, a Byzantine naval expedition under Megadoux John Doukas inflicted a heavy defeat on him and retook Lesbos. He was later slain by his son-in-law the Sultan of Rum Kilij Arslan I the next year. Smyrna and the rest of Tzachas' former domain were recovered by the Byzantines a few years later, in c. 1097.