John Komnenos (Latinized as Comnenus), nicknamed "the Fat" (Greek: Ἰωάννης Κομνηνὸς ὁ παχύς), was a Byzantine noble who attempted to usurp the imperial throne from Alexios III Angelos in a short-lived coup in Constantinople on 31 July 1201 (or 1200). The coup drew on opposition to the ruling Angelid dynasty among both rival aristocratic families and the common people, who were dissatisfied by the dynasty's failures against external foes. Hitherto an obscure figure, John became the figurehead of the uprising because of his imperial blood, as he was descended from the illustrious Komnenian dynasty (1081–1185), but the real driving force behind his coup was probably the ambitious Alexios Doukas Mourtzouphlos. With the support of the capital's populace, the plotters managed to seize most of th