sentences:  Accordingly, he thought that the attack had happened during the period of Iconoclasm (before 842), notably dating it to the years 825–830.Alexander Vasiliev pointed out that Emperor Theophilus provided for the safe conduct of the Rus', who had somehow arrived at Constantinople (ca.838), through Frankish lands by his embassy to Louis the Pious of 839, as witnessed to by the Annals of St. Bertin, which is inconsistent with the assumption that the raid had at that time already taken place.