Константин VII Багрянородный
As ruler of Lendians, he paid tribute to Kievan Rus', which is confirmed by archaeological studies and biography of Constantine VII Porphyrogennetos. In 944/945 Duke sent his emissary Uleb to Constantinople, where took place talks on peace between Igor of Kiev and Byzantine emperors: Romanos I Lekapenos and Constantine VII, as evidenced by "Nestor Chronicle".