Freed from the Saracen war, which had threatened not merely to curtail, but to extinguish the empire, Constans was at liberty to turn his attention to other matters. It seems probable that it was at this moment that the reorganization of the provinces of the empire took place, which we find in existence in the second half of the seventh century. The old Roman names and boundaries, which had endured since Diocletian’s time, now disappear, and the empire is found divided into new provinces with strange denominations. They were military in their origin, and each consisted of the district covered by a large unit of soldiery—what we should call an army corps. “Theme” meant both the corps and the district which it defended, and the corps-commander was also the provincial governor. There were six corps in Asia, called the Armeniac, Anatolic, Thracesian, Bucellarian, Cibyrrhæot, and Obsequian themes. Of these the first two explain themselves, they were the “army of Armenia” and the “army of the East”; the Obsequian theme, quartered along the Propontis, was so called because it was a kind of personal guard for the Emperor and the home districts. The Thracesians were the “Army of Thrace,” who in the stress of the war had been drafted across to Asia to reinforce the Eastern troops. The Bucellarii seem to have been corps composed of natives and barbarian auxiliaries mixed; they are heard of long before Constans, and he probably did no more than unite them and localize them in a single district. The Cibyrrhæot theme alone gets its name from a town, the port of Cibyra in Pamphylia, which must have been the original headquarters of the South-Western Army Corps. Its commander had a fleet always in his charge, and his troops were often employed as marines.(21) The western half of the empire seems to have had six “Themes” also; they bear however old and familiar names—Thrace, Hellas, Thessalonica, Ravenna, Sicily, and Africa, and their names explain their boundaries. In both halves of the empire there were, beside the great themes, smaller districts under the command of military governors, who had charge of outlying posts, such as the passes of Taurus, or the islands of Cyprus and Sardinia. Some of these afterwards grew into independent themes. Thus came to an end the old imperial system of dividing military authority and civil jurisdiction, which Augustus had invented and Diocletian perpetuated. Under stress of the fearful Saracenic invasion the civil governors disappear, and for the future a commander chosen for his military capacity has also to discharge civil functions.