The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors,...

The Herodian tetrarchy was a regional division of a client state of Rome, formed following the death of Herod the Great in 4 BCE. The latter's client...

The civil wars of the Tetrarchy were a series of conflicts between the co-emperors of the Roman Empire, starting from 306 AD with the usurpation of Maxentius...

disintegrations of the Crisis of the Third Century. He introduced the system of the Tetrarchy in 286, with two senior emperors titled Augustus, one in the East and...

Thessalian League for life; a few years later (344 BC), he re-established the tetrarchies (or tetradarchie), installing governors devoted to his interests and...

officer of Illyrian origin who had been one of the four rulers of the Tetrarchy. His mother, Helena, was a Greek woman of low birth, probably from Asia...

wife of Licinius Licinius II Eutropia Nepotianus Other rulers of the tetrarchy were related to the Constantinian dynasty: Maximian: adoptive father and...

descent, ruling the Herodian Kingdom of Judea and later the Herodian Tetrarchy as a vassal state of the Roman Empire. The Herodian dynasty began with...

the title Caesar), under himself and Maximian respectively. Under the Tetrarchy, or "rule of four", each tetrarch would rule over a quarter-division of...

east), a status which the city maintained during the Tetrarchy system (293–324). The Tetrarchy ended with the Battle of Chrysopolis (Üsküdar) in 324...