He became sole emperor in August 394, after defeating the usurper Eugenius. The Greeks had their own conception of what a usurper was, calling them tyrants. Relations soured further when Juan called Franco an "illegitimate usurper". Constans was overthrown and assassinated in 350 by the usurper Magnentius. Though Richard III was regarded as a usurper, his reign was not ignored. He proclaimed the Plan of Guadalupe to oust Huerta as an unconstitutional usurper. Odaenathus attacked the remaining usurper and quelled the rebellion. The Roman population there thus attacked rose in rebellion under the usurper Constantine III. Herod, as King of the Jews, was alarmed at the prospect of a usurper. The rebels were mostly loyalists to Edward IV, who saw Richard as a usurper. Busir was offered a bribe by the Byzantine usurper, Tiberius III, to kill Justinian. Their actions could secure the empire for a usurper or take it away. Alexander viewed Bessus as a usurper and set out to defeat him. I's victory over the usurper, Maximus. He was nicknamed "His Accidency" and excoriated as a usurper.