•The Tema System and its Historical Background The theme (Greek: singular – θέμα, plural – θέματα themata), was the main local administrative unit of the Byzantine Empire for approximately seven centuries. The word means military division. The theme system was established in the late 7th century, replacing the earlier main local unit, the Roman diocese, 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 from 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 type of military region and to the local administrative units of the civilian population. The theme was the organization of the parcels of land granted to the soldiers for farming. Technically, the soldiers were military units formed to fight under the command of a strategos (provincial governor). They were not the owners of the land they were given and farmed; the land belonged to the state. The soldiers who worked the land had the right to harvest the crops 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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