In 293, two soldiers, Constantius Chlorus and Maximianus Galerius, were raised to the purple as Caesars. The diarchy was transformed into a tetrarchy. With the partition into four areas, the western parts to Maximian and Constantius Chlorus, the eastern to Diocletian himself and Galerius, the centres of decision were brought closer to the more critical frontier zones. It was an attempt to resolve a structural problem in a large territorial Byzantine empire. To strengthen the new regime a new legitimation of imperial power was devised: one that exploited a particular religious climate, while at the same time aiming to trace its roots in the Roman tradition. The administrative reforms, which were connected with the reorganizations of the army, of taxation and even of the coinage, were an effective response to danger from without and to the threat of disintegration. The main feature of Aurelian's reform was the division of the existing provinces into smaller territorial entities.