would be the permanent territory from then on after restoration in 395. Following Constantine's victory over Licinius and the unification of the Empire under his rule, the office was transformed. The prefect's military duties were removed by the creation of the purely military offices of the magister peditum and magister equitum ("Master of the Foot/Horse"), and the establishment of the magister officiorum as the powerful head of the palatine bureaucracy and the civil service at large provided a counterbalance to the prefect's power. These reforms were the result of both the lack of officials suitable for the prefect's wide-ranging tasks, and of the desire to reduce the potential challenge to the emperor's authority posed by the over-mighty prefect. The office of the prefect was consequently converted into a purely civilian administrative one, albeit retaining the highest position in the imperial hierarchy, immediately below the emperor himself. Another important departure from Tetrarchic practice was the increase in the number of holders: no less than five prefects are attested for ca. 332. This development is likely related to Constantine's giving his four sons specific territories to administer, envisioning a partition of imperial authority among them following his death. In this, the origins of the later territorial prefectures may be detected. After Constantine's death in 337, his three surviving sons partitioned the Empire between them. As each new Augustus had his own praetorian prefect, this division created the first of what would gradually become the permanent praetorian prefectures: the western prefecture of Gaul (dioceses of Gaul, Viennensis, Hispania and Britain), the central prefecture of Italy, Illyricum and Africa (dioceses of Italy, Africa, Pannonia, Dacia and Macedonia) and the prefecture of the East (dioceses of Thrace, Asia, Pontus, Oriens). Egypt was part of the diocese of Oriens until 370 or 381. With the creation of the separate prefecture of Illyricum (dioceses of Pannonia, Dacia and Macedonia) in 347 until 361, and despite the occasional abolition of the latter, the picture that appears in the early 5th-century Notitia dignitatum ("list of dignities") was complete. The only major change was the removal of the diocese of Pannonia (renamed "Diocese of Illyricum") from the prefecture of Illyricum and its incorporation into the prefecture of Italy in 379. The diocese of Italy was in practice divided into two: of Italy in the north, and Suburbicarian ("under the City") Italy in the south including Sicily, Corsica and Sardinia. There