Alexius V (Alexius Ducas Mourtzouphlos) (əlĕk´sēəs, dōō´kəsmŏŏrt´sōōflŏs), d. 1204, Byzantine emperor (1204), son-in-law of Alexius III. The head of the Byzantine national party, he overthrew emperors Isaac II and Alexius IV (who had been installed by the Crusaders), thus precipitating the conquest and sack of Constantinople (1204) by the army of the Fourth Crusade (see Crusades). He was deposed and executed, and Baldwin I was elected by the Crusaders as Latin emperor of Constantinople.
"Alexius V." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (January 23, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/alexius-v
"Alexius V." The Columbia Encyclopedia, 6th ed.. . Retrieved January 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/alexius-v