The themes or thémata (Greek: θέματα, thémata, singular: θέμα, théma) were the main military and administrative divisions of the middle Byzantine Empire. They were established in the mid-7th century in the aftermath of the Slavic migrations to the Balkans and Muslim conquests of parts of Byzantine territory, and replaced the earlier provincial system established by Diocletian and Constantine the Great. In their origin, the first themes were created from the areas of encampment of the field armies of the East Roman army, and their names corresponded to the military units that had existed in those areas. The theme system reached its apogee in the 9th and 10th centuries, as older themes were split up and the conquest of territory resulted in the creation of new ones. The original theme system underwent significant changes in the 11th and 12th centuries, but the term remained in use as a provincial and financial circumscription until the very end of the Empire.
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Theme (country subdivision) in the context of Armeniac Theme
The Armeniac Theme (Greek: Ἀρμενιακόν [θέμα], Armeniakon [thema]), more properly the Theme of the Armeniacs (Greek: θέμα Ἀρμενιακῶν, thema Armeniakōn), was a Byzantine theme (a military-civilian province) located in northeastern Asia Minor (modern Turkey).
Theme (country subdivision) in the context of Opsician Theme
The Opsician Theme (Greek: θέμα Ὀψικίου, thema Opsikiou) or simply Opsikion (Greek: [θέμα] Ὀψίκιον, from Latin: Obsequium) was a Byzantine theme (a military-civilian province) located in northwestern Asia Minor (modern Turkey). Created from the imperial retinue army, the Opsikion was the largest and most prestigious of the early themes, being located closest to Constantinople. Involved in several revolts in the 8th century, it was split in three after c. 750, and lost its former pre-eminence. It survived as a middle-tier theme until after the Fourth Crusade.
Theme (country subdivision) in the context of Anatolics
The Anatolic Theme (Greek: Άνατολικόν [θέμα], Anatolikon [thema]), more properly known as the Theme of the Anatolics (Greek: θέμα Άνατολικῶν, thema Anatolikōn), was a Byzantine theme (a military-civilian province) in central Asia Minor (modern Turkey). From its establishment, it was the largest and senior-most of the themes, and its military governors (stratēgoi) were powerful individuals, several of them rising to the imperial throne or launching failed rebellions to capture it. The theme and its army played an important role in the Arab–Byzantine wars of the 7th–10th centuries, after which it enjoyed a period of relative peace that lasted until its conquest by the Seljuk Turks in the late 1070s.