Opsikion

Theme of Opsikion Ὀψίκιον, θέμα Ὀψικίου
Theme of the Byzantine Empire
640s/660s–1230s
The Asian themes of the Byzantine Empire c. 780
Capital	Ancyra, then Nicaea
Historical era	Middle Ages
• Established	640s/660s
• Fall to the Latins	1234
Today part of	Turkey

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 ca. 750, and lost its former pre-eminence. It survived as a middle-tier theme until after the Fourth Crusade.