•The emergence and historical background of the Thema system The Thema (Greek: singular – θέμα, plural – θέματα themata), was the main local administrative unit of the Byzantine Empire for approximately seven centuries. The word means military territory. The Thema system was established in the late 6th and early 7th centuries, replacing the earlier main local unit, the Roman diakos system, which had been established by the Roman emperors Diocletian and Constantine I.
The reason for this division was that it allowed local governors to command the troops in their regions, declare themselves autonomous emperors, and attempt to seize central authority with the local troops. This system generally produced satisfactory results for 300 years in each region of the Byzantine Empire.
The term “thema” has two different meanings. It refers both to a kind of military region and to the local administrative units of the civilian population. The theme was the organization of the plots of land granted to the soldiers for farming. Technically, the soldiers were military units formed to fight under the command of a strategos (governor). They were not the owners of the land they were given and cultivated; the land belonged to the state. The soldiers who worked the land had the right to harvest and to receive the produce and the profits from it.
The theme system was constantly shocked by the decline of the Byzantine Empire and became very difficult to implement, as many old regions were lost and many of the regions in the border areas were constantly changing hands, with the new territories not being conquered. On the other hand, the Franks, who captured Constantinople and established the Latin Empire with the Fourth Crusade, established feudal states by applying a medieval hierarchical system similar to the Frankish apanage system, which was attached to this empire. This was another reason for the collapse of the theme system.
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