 A special case was Egypt, a rich 'private' domain and vital granary, where the Emperor almost inherited the theocratic status of a Pharaoh.The Emperor was represented there by a governor "sui generis" styled "praefectus augustalis", a title evoking the religious cult of the Emperor.Emperors Diocletian (see Tetrarchy) and Constantine in the third and fourth centuries AD carried out a root and branch reorganisation of the administration with two main features