CONSTANTINE X. Ducas, emperor 1059-67, succeeded Isaac I. Comnenus (q.v.). But the choice was not justified, for Constan tine, who had shown himself a capable minister, proved incompe tent as an emperor. He reduced the army, cut down the soldiers' pay, failed to keep up the supply of war material, and neglected the frontier fortresses at a time when the Seljuk Turks were press ing hard upon the eastern portion of the empire. Alp Arslan over ran Armenia in 1064. The Magyars occupied Belgrade, the Petch enegs (Patzinaks) continued their inroads, and in 1065 the Uzes (called by the Greeks Comani), a Turkish tribe from the shores of the Euxine, crossed the Danube in vast numbers, ravaged Thrace and Macedonia, and penetrated as far as Thessalonica. The empire was only saved by an outbreak of plague amongst the invaders and the bravery of the Bulgarian peasants. In the year before Con stantine's death the remnant of the Byzantine possessions in Italy was finally lost to the empire, and the chief town, Bari, taken by the Normans. (H. S. J.) For the later Constantines references to general authorities will be found under ROMAN EMPIRE, LATER; see also CALIPHATE and SELJUKS for the wars of the period.