What is emperor Diocletian known for?

Answer 1

Diocletian unleashed the worse persecution of Christians in the history of the Roman: the Great Persecution.

Diocletian subdivided the Empire into four administrative units and created the tetrarchy (rule by four). He appointed fellow general Maximian as co-emperor in 285. Maximian took overall control of the western part of the empire, while Diocletian took overall control of the eastern part. Then these two men became senior emperors (Augusti) with the creation in 293 of two junior emperors (Caesars) who were subordinates of the Augusti. Diocletian also created the four praetorian prefectures of Galliae(Gaul, Britannia and Hispania), Italia et Africa, Illyricum (the Balkan Peninsula except for Thracia, in the southeast, next to modern Turkey) and Oriens (Thracia, the territories in Asia and Egypt). . Maximian took charge of Italia et Africa and Diocletian took charge of Oriens. The Caesars Constantius and Galerius took charge of Galliae and Illyricum respectively. One of the tasks of the Caesars was to defend the troubled frontiers along the rivers Rhine and Danube respectively, which had been under constant attack from outside.

Diocletian also designated four cities ans new imperial capitals: Nicomedia (in north-western Turkey), Augusta Trevorum (Triers in Germany near the river Rhine) and Sirmium (near Belgrade on the river Danube).

Answer 2

As emperor Diocletian took power in the late 200's