The theme system, which was established in the seventh century when the Byzantine Empire began to be invaded by Muslim armies, replaced the earlier main local unit, the Roman diocese 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 as 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 to both a kind of military region and to a local administrative unit. The theme was the organization of the land parcels granted to the soldiers for farming. Technically, the soldiers were military units formed to fight under the command of a strategos (governor of a province). 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 yield and profit from the cultivated land.

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, especially in the border regions, and many of them were constantly changing hands. 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 also contributed to the collapse of the theme system.



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