Opsikion

Theme of Opsikion
Ὀψίκιον, θέμα Ὀψικίου
Theme of the Byzantine Empire
640s/660s–1230s

The Asian themes of the Byzantine Empire c. 780
CapitalAncyra, then Nicaea
Historical eraMiddle Ages
• Established
640s/660s
• Fall to the Latins
1234
Today part ofTurkey

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.