sentences:  Thus, rejecting Vasilievsky's arguments as to authorship and date of the work, he identified the Paphlagonian expedition described in the "Life" with the raid in 860 that reached Constantinople.Constantine Zuckerman, however, maintains a higher dating of the sack of Amastris to the 830s and holds the 838 embassy of the Rus' to Constantinople, as recorded in the same entry of the Annals of St. Bertin, to be an attempt at negotiating a peace treaty with Byzantium.Other scholars believe the raid took place as early as 818 or 819.