293 CE
March 1
March 1
Maximian promotes Constantius Chlorus to Caesar with the approval of Diocletian.
296 CE
Constantine I fights against barbarians on the Danube for Diocletian.
297 CE
Constantine I fights against Persians in Syria with Diocletian.
303 CE
February 23
February 23
Diocletian orders the new church in Nikomedia destroyed and its treasure taken.
305 CE
May 1
May 1
Diocletian announces his resignation. Maximian follows suit. Constantius and Galerius are promoted to Augusti, while Severus II and Maximinus are appointed Caesars.
308 CE
November 11
November 11
Galerius calls a council to discuss the disruptive western provinces. Diocletian and Maximian attend. Maximian is forced to abdicate and Constantine the Great is demoted to Caesar under the new Augustus Licinius.