Tetrarchy: Timeline

293   Diocletian Diocletian

Gaius Aurelius Valerius Diocletianus , born ??????? and known in English as Diocletian, wa... 

 and Maximian Maximian

Marcus Aurelius Valerius Maximianus Herculius, known in English as Maximian, was Roman Emperor [i] ... 

 appoint Constantius Chlorus Constantius Chlorus

Flavius Valerius Constantius was an emperor [i] of the Western Roman Empire [i]. ... 

 and Galerius Galerius

Galerius Maximianus, formally Gaius Galerius Valerius Maximianus, Roman Emperor [i] from 305 [i] t ... 

 as Caesar Caesar (title)

Caesar, Latin [i]: Csar, is a title [i] of imperial [i] character. ... 

s. This is considered the beginning of the Tetrarchy.

308   The Congress of Carnuntum: Attempting to keep peace within the Roman Empire, the leaders of the Tetrarchy declare Maxentius Maxentius

Marcus Aurelius Valerius Maxentius was Western Roman Emperor [i] from 306 [i] to 312. ... 

 and Licinius Licinius

Flavius [i] Galerius Valerius [i] Licinianus Licinius was Roman emperor [i] from 308 to 324 [i]... 

 to be Augusti, while rival contender Constantine I Constantine I

Gaius Flavius Valerius Aurelius Constantinusantine is best remembered in modern times for the Edict of Milan [i] ... 

 is declared Caesar Caesar (title)

Caesar, Latin [i]: Csar, is a title [i] of imperial [i] character. ... 

 of Britain Britain

The word Britain is an informal term used when referring to; ... 

 and Gaul Gaul

Gaul was the name given, in ancient times, to the region of Western Europe [i] comprising present-day n ... 

324   Constantine definitively defeats Licinius at the Battle of Chrysopolis, and becomes sole emperor, thus ending the Tetrarchy.