バトゥ
After reaching the Crimean town of Sudak, William continued his trek with oxen and carts. Nine days after crossing the Don, he met Sartaq Khan, ruler of the Kipchak Khanate. The Khan sent William on to his father, Batu Khan, at Sarai near the Volga River. Five weeks later, after the departure from Sudak, he reached the encampment of Batu Khan, Mongol ruler of the Volga River region. Batu refused conversion but sent the ambassadors on to the Great Khan of the Mongols, Möngke Khan.