Ioannes known in English as Joannes was a Roman usurper (423–425) against Valentinian III.On the death of the Emperor Honorius (August 15 423) Theodosius II the remaining ruler of the House of Theodosius hesitated in announcing his uncle’s death. In the interregnum Honorius’s patrician at the time of his death Castinus elevated Joannes as emperor.
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