Çaka (or possibly Çakan) Bey was a Turkish emir who founded an Islamic polity based on the town of Smyrna (modern İzmir) in or just before 473-4/1081, one of a number of states set up by Turkish military strongmen in Anatolia in the years following the Saljūq victory over the Byzantines at Manzikert (Malazgirt, 463/1071). Very little is known about his activities during his period of rule, and our knowledge is based almost exclusively on The Alexiad , a Greek biography of the Byzantine emperor Alexios I Komnenos