The Fall of Jerusalem and the Captivity
In 614, during the reign of the Byzantine emperor Heraclius, Sasanian Persian forces under the emperor Chosroes (Khosrow II) overran Byzantine Syria and took Jerusalem. The synaxarion accounts relate that the city was looted and that the invaders withdrew bearing the Life-Creating Cross of Christ together with a large number of Christian captives. By tradition, as many as ninety thousand of the captured Christians perished.
Patriarch Zacharias was taken among the prisoners and carried into Persia along with the True Cross. The Orthodox sources record that he and the Cross were held in bondage for fourteen years, so that he passed most of his episcopate in exile. During his absence, the affairs of the Jerusalem church were administered by Modestus, who acted as locum tenens (administrator) of the patriarchal throne.