
Diocletian 'Jovius'
20 November 284 – 1 May 305 (20 years, 5 months and 11 days) Whole; then East
Diocletian restored imperial stability after the third-century crisis and created the Tetrarchy. Late in his reign, the empire launched the most extensive official persecution of Christians to that time.
Maximian 'Herculius'
1 April 286 – 1 May 305 (19 years and 1 month; West) Late 306 – 11 November 308 (2 years; Italy)
Maximian served as Diocletian's western co-emperor and helped establish the Tetrarchic system. He later returned to imperial politics during the succession struggles that followed their abdication.
Galerius
1 May 305 – May 311 (6 years; East)
Galerius rose through Diocletian's Tetrarchy and became senior eastern emperor in AD 305. A leading figure in the Great Persecution, he later issued an edict tolerating Christianity shortly before his death.
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