 The services rendered by Kokos to Ivan may partly explain the latter's favorable attitude toward the Jews.The part played by Kokos as the agent of the grand duke is shown by the instruction given by the latter to his emissary, the "boyar" Nikita Beklemishev, dated March, 1474.In this letter Beklemishev is instructed by Ivan to transmit to Kokos his diplomatic credentials to the court of the khan and the regards of the grand duke.