The Opsician Theme or simply Opsikion was a Byzantine theme located in northwestern Asia Minor. 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.

Artemius Anastasius, known as Anastasius II, was the Byzantine emperor from 713 to 715. His reign was marked by significant religious and political decisions aimed at stabilizing the Empire. One of his notable actions was reversing the previous appointment of a Monothelete patriarch of Constantinople, instead reinstating Orthodoxy by appointing Germanus I to the position. This move was made in an effort to gain the favor of Pope Constantine.