Praetorian prefecture of Illyricum was created in 357.
Praetorian prefecture of the East was created in 337.
The Praetorian was created in 2007.
The Roman Empire was never divided into two parts. Western Roman Empire and Eastern Roman Empire are terms which have been coined by historians. The Romans had only one term: Roman Empire. The emperor Diocletian subdivided the Roman Empire into four (not two) main administrative units, the praetorian prefectures, in 293. They were Oriens (The East, north-eastern Greece and eastern Bulgaria, the Roman territories in Western Asia and Egypt, which comprised Egypt and the coast of eastern Libya), Illyricum (the Roman territories in the Balkan Peninsula except eastern Bulgaria and north-eastern Greece), Italia et Africa (Rhaetia; that is, Switzerland and part of Austria and Bavaria, Italy, the coast of central and western Libya, Tunisia, and the coast of Algeria) and Galliae, (Galiae; that is, France, Belgium, Holland south of the River Rhine and Germany west of the Rhine; Hispaniae; that is, Spain, Portugal and northern Morocco; and Britannia; that is, England and Wales).The emperor Diocletian created the tetrarchy (rule by four) which had two senior emperors (Augusti) and two junior ones (Caesars). Each of the four emperors was in charge of one of the praetorian prefectures and was given an imperial seat. Therefore, there were four "capitals": Nicomedia (modern Izmit in north-western Turkey) for the praetorian prefecture of Oriens, Sirmium (modern Sremska Mitrovica, near Belgrade, in Serbia) for the praetorian prefecture of Illyricum, Mediolanum (modern Milan in Italy) for the praetorian prefecture of Italia et Africa and Augusta Trevorum (modern Triers in Germany) for the praetorian prefecture of Galliae. Rome ceased to be the capital of the Roman Empire. Diocletian and Maximian, the two Augusti, were in charge of Oriens and Italia et Africa respectively. Galerius and Constantius, the two Caesars, were in charge of Illyricum and Galliae respectively
Praetorian Building was created in 1909.
Praetorian - novel - was created on 2011-11-10.
First of all, regarding the use of the word empires: there was only one Roman Empire. The emperor Diocletian created new administrative subdivisions on top of the provinces, which he reduced in size and doubled in number. These were 12 dioceses and four praetorian prefectures. He also created the tetrarchy (rule by four) where the empire was ruled by two senior emperors (Augusti, Diocletian and Maximian) and two junior emperors (Caesars, Galerius and Constantius Chorus),with each in charge of one of the four praetorian prefectures. Diocletian was in charge on the eastern part of the empire and the praetorian prefecture Oriens (the East, the Middle East, Egypt and Thrace - south-eastern Bulgaria and north-eastern Greece). Maximian was in charge of the east and the praetorian prefecture of Italia et Africa. Galerius was in charge of the praetorian prefecture of Illyricum (the Balkan Peninsula except for Thrace). Constantius Chlorus was in charge of the Praetorian prefecture of Galliae (Hispania, Gaul and Britannia).Diocletian also designated four imperial capitals: Nicomedia (modern Izmit, in north-western Turkey) for Oriens, Mediolanum (modern Milan in northern Italy) for Italia et Africa), Sirmium(modern Sremska Mitrovica, in Serbia) for Illyricum, and Augusta Treverorum (modern Trier, in Germany). Rome had already ceased to be the political pivot of the empire because it was far from the troubled frontiers of the empire and many of the emperors in the third century were military men not connected with the city of Rome).When Constantine the Great became the sole emperor after winning two civil wars, he created his own imperial capital. He redeveloped Byzantium and renamed it Constantinople. The Valentinian dynasty created a co-emperorship with one emperor in charge of the east and one of the easts. Constantinople remained the capital in the east and Milan remained the capital in the west. In 402 the capital in the east was moved from Milan to Ravenna.Terms such as Western Roman Empire and Eastern Roman Empire have been coined by historians. The Romans did not use them
Miyagi Prefecture was created in 1871.
Kyoto Prefecture was created in 1868.
Samos Prefecture was created in 1915.
Vientiane Prefecture was created in 1989.
Karafuto Prefecture was created in 1905.
Taihoku Prefecture was created in 1920.