(Alexius Angelus), d. after 1210, Byzantine emperor (1195-1203). He acceded to power by deposing and blinding his brother Isaac II. This act served as pretext for the leaders of the Fourth Crusade (see Crusades
) to attack Constantinople (1203). The Crusaders made Isaac II and his son Alexius IV coemperors, Alexius III having fled. In 1204, Alexius III's son-in-law was briefly emperor as Alexius V. Another son-in-law, Theodore I, became emperor of Nicaea. Alexius died in obscurity.
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