Igor twice besieged Constantinople in 941 and 944, and although Greek fire destroyed part of his fleet, he concluded with the Byzantine Emperor Constantine VII a favourable treaty (945), the text of which the chronicle has preserved. In 913 and 944 the Rus' plundered the Arabs in the Caspian Sea during the Caspian expeditions of the Rus', but it remains unclear whether Igor had anything to do with these campaigns.