Heraclian Dynasty - The Theme System

The Theme System

The army of the Empire that Heraclius worked so hard to improve eventually was reorganized in Asia Minor into four Themes, in what is now known as the Theme system. This system was originally credited by Byzantine historians like George Ostrogorsky to Heraclius. He provides Theophanes as a source, quoting the expression "the district of the themes" in the year 622, showing the themes had begun to be created at this time. However, there is evidence presented by some modern historians that it could possibly be credited to Constans, and yet others leave the door open that Heraclius could possibly have done so in the late 630s in Cilicia. In any case, the debate over exactly when the thematic system originated continues on.

The administrative regions created from this system were to be governed by a strategos, a military governor. The aim of these Themes was to maximize military potential — many able-bodied men and their families were settled in these four themes and given land for farming. In return for land, these men were to provide the Empire with loyal soldiers, and so began the Thematic armies of the Byzantine Empire that would prove to be reliable, though not unbeatable fighting force for centuries to come. Nonetheless, a native, well-trained army loyal to the state would serve the Empire far more than ill-disciplined mercenaries, whose loyalty to coin could be manipulated and turned against the state itself, as had been exemplified during the Fall of the Western Roman Empire.