Roman Emperor (r. 284-305 CE) who reorganized the empire through the tetrarchy system, dividing rule among four emperors, and initiated the last major persecution of Christians.
Born Diocles, he took the name Diocletianus upon becoming emperor, possibly from 'Diocles' (a Greek name meaning 'glory of Zeus') combined with the Latin imperial suffix '-ianus.'
Diocletian was the only Roman emperor to voluntarily retire—after 21 years of rule, he stepped down to grow cabbages in his palace garden in Croatia! His tetrarchy system temporarily stabilized the empire but ultimately led to civil wars, including the rise of Constantine who would legalize the very Christianity Diocletian had tried to destroy.
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