The origin of the feast is assigned by the Synaxarion to the year 626, when Constantinople, in the reign of Heraclius, was attacked by the Persians and [[Pannonian Avars
|Avars]] but saved through the intervention of the Most Holy Theotokos. A sudden hurricane dispersed the fleet of the enemy, casting the vessels on the shore near the Great church of the Theotokos at Blachernae, a quarter of Constantinople inside the Golden Horn. The people spent the whole night, says the account, thanking her for the unexpected deliverance. "From that time, therefore, the Church, in memory of so great and so divine a miracle, desired this day to be a feast in honour of the Mother of God ... and called it Acathistus" (Synaxarion). This origin is disputed by Sophocles (
Greek Lexicon of the Roman and Byzantine Periods, s. v.) on the ground that the hymn could not have been composed in one day, while on the other hand its twenty-four oikoi contain no allusion to such an event and therefore could scarcely have been originally composed to commemorate it. Perhaps the kontakion, which might seem to be allusive, was originally composed for the celebration on the night of the victory. However the feast may have originated, the Synaxarion commemorates two other victories, under Leo III the Isaurian, and Constantine Pogonatus, similarly ascribed to the intervention of the Theotokos.
No certain ascription of its authorship can be made. It has been attributed to Patriarch Sergius I of Constantinople, whose pious activities the Synaxarion commemorates in great detail.
Quercius (P.G., XCII, 1333 sqq.) assigns it to George Pisida, deacon, archivist, and sacristan of Hagia Sophia whose poems find an echo both in style and in theme in the Akathist; the elegance, antithetic and balanced style, the vividness of the narrative, the flowers of poetic imagery being all very suggestive of his work. His position as sacristan would naturally suggest such a tribute to the Theotokos, as the hymn only gives more elaborately the sentiments condensed into two epigrams of Pisida found in her church at Blachernae. Quercius also argues that words, phrases, and sentences of the hymn are to be found in the poetry of Pisida. Leclercq (in Cabrol, Dictionnaire d’archéologie chrétienne et de liturgie, s.v. "Acathistus") finds nothing absolutely demonstrative in such a comparison and offers a suggestion which may possibly help to a solution of the problem.