CONSTANTINE X  . Ducas, emperor 1059–1067, succeeded Isaac I . Comnenus (q.v.) . But the choice was not justified, for Constantine, who as the friend and minister of Isaac had shown himself a capable statesman and financier, proved incompetent as an emperor . He devoted himself to philosophical trifling, petty administrative and judicial details, while his craze for economy developed into avarice . 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 pressing hard upon the eastern portion of the empire . Alp Arslan, the successor of Toghrul Beg, overran Armenia in 1064, and destroyed its capital Ani . The Magyars occupied Belgrade, the Petchenegs (Patzinaks) continued their inroads, and in 1o65 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 Constantine'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 . For the later Constantines references to general authorities will be found under ROMAN EMPIRE, LATER; see also CALIPHATE and SELTuies for the wars of the period .