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Alexius II(Alexius Comnenus), 1168–83, Byzantine emperor (1180–83), son and successor of Manuel I. His mother, Mary of Antioch, who was regent for him, alienated the population by favoring the Latin element in Constantinople. In 1182 Alexius' cousin Andronicus, after instigating a massacre of the Latins, stormed the city, had Alexius sign the death sentence of his mother, and, as Andronicus I, became coemperor. One month later he strangled Alexius and married his widow.
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