The Rus'–Byzantine War of 941 took place during the reign of Igor of Kiev.[n 2] The Khazar Correspondence reveals that the campaign was instigated by the Khazars, who wished revenge on the Byzantines after the persecutions of the Jews undertaken by Emperor Romanus I Lecapenus.[citation needed] The first naval attack was driven off and followed by another, successful offensive in 944.[5] The outcome was the Rus'–Byzantine Treaty of 945.[6]