Diocletian's Redistricting of the Roman Empire

In the mid two nineties, a d most likely, right as the tetrarchy was being formed, diocletian initiated a re districting of the empire on a massive scale. Diocletian undertook the redrawing of the provincial lines for two main military reasons. He wanted to divide up the dangerous and perpetually besieged outer rim of the empire into softer and more prosperous inner territories. The former would become essentially military districts, while the latter would be allowed to go back to being simply provinces - undistracted economic engines for the empire.