Athonite monastic tradition credits the text to a tenth century revelation to a monk at Karyes, but that account is devotional legend, not a documented event, and no independent manuscript or historical source establishes the hymns actual date or author.
What would resolve this A dated manuscript witness to the text earlier than, or independent of, the Athonite legend, or a specialist study of Byzantine Marian hymnography that traces the hymns transmission history on textual rather than legendary grounds.
OpenByzantine liturgical history; hymnographyF. L. Cross and E. A. Livingstone (eds.), The Oxford Dictionary of the Christian Church, 3rd revised edition