territories. He then makes pace with Constantine, who remains as the emperor of the West. Both augusti appoint their own sons as caesares, restoring a dynastic system. They eventually go to war against each other once more, ending with the final victory of Constantine. Chronological table Legacy Although the tetrarchic system as such only lasted until 313, many aspects of it survived. The fourfold regional division of the empire continued in the form of Praetorian prefectures, each of which was overseen by a praetorian prefect and subdivided into administrative dioceses, and often reappeared in the title of the military supra-provincial command assigned to a magister militum. The pre-existing notion of consortium imperii, the sharing of imperial power, and the notion that an associate to the throne was the designated successor (possibly conflicting with the notion of hereditary claim by birth or adoption), was to reappear repeatedly. The idea of the two halves, the east and the west, re-emerged and eventually resulted in the permanent de facto division into two separate Roman empires after the death of Theodosius I; though, importantly, the Empire was never formally divided. The emperors of the eastern and western halves legally ruled as one imperial college until the Fall of the Western Roman Empire left Byzantium, the "second Rome", as the sole direct heir. Other examples Tetrarchies in the ancient world existed in both Thessaly (in northern Greece) and Galatia (in central Asia Minor; including Lycaonia) as well as among the British Cantiaci. The constellation of Jewish principalities in the Herodian kingdom of Judea was known as a tetrarchy; see Tetrarchy (Judea). In the novel The Lion, the Witch and the Wardrobe, the Pevensie siblings rule Narnia as a tetrarchy of two kings and two queens. See also Notitia dignitatum, a later document from the imperial chancery Notes Citations References External links A detailed chronology of the tetrarchy from Diocletian to Constantine A chart showing the tetrarchy from Diocletian to Constantine 293 establishments 313 disestablishments 290s establishments in the Roman Empire 310s disestablishments in the Roman Empire 3rd century in the Roman Empire 4th century in the Roman Empire States and territories established in the 290s States and territories disestablished in the 4th century Constitutional state types Emperors Monarchy 290s in the Roman Empire Roman emperors Crisis of the Third Century