But the Greeks soon looked for the fountain of justice elsewhere than on the banks of the Tiber. With the reign of Diocletian began the practice of removing the seat of Government from Rome, and that Emperor usually resided at Nicomedia. His establishment of four great administrative divisions of the Empire really separated the two Eastern, in which Greece was comprehended, from the two Western, and prepared the way for the foundation of Constantinople by Constantine and the ultimate division of the Eastern and Western Empires. Diocletian’s further increase in the number of the provinces, several of which were grouped under one of the Dioceses, into which the Empire was split up for administrative purposes, had the double effect of altering the size of the Greek provinces, and of scattering them over several Dioceses. Thus Achaia, Thessaly, “Old” Epeiros (as the region round Nikopolis was now called), and Crete, formed four separate provinces included in the Mœsian Diocese, the administrative centre of which was Sirmium, the modern Mitrovitz. The Ægean islands, on the other hand, composed one of the provinces of the Asian Diocese. The province of Achaia had, however, the privilege of being administered by a Proconsul, who was an official of more exalted rank than the great majority of provincial governors. Side by side with these arrangements, the currency reform of Diocletian and the edict by which he fixed the highest price of commodities cannot fail to have affected the trade of Greece, while his love of building benefited the Greek marble quarries.