Who established the khanate of the Golden Horde?
Batu and Orda established the Khanate of the Golden Horde. Golden Horde were actually the settled Mongols that ruled over the countries of Russia, Moldova, Ukraine, Kazakhstan and Caucasus for a period starting from 1240s until the year 1502. Batu Khan was the person who established Golden Horde and he was the grandson of Genghis Khan.
Contrary to some ideas, it was not Genghis Khan - the greatest Mongolian warlord of all time, who established the golden horde. While he really did start massive conquests in Asia, it was his grandson (at east one of them) Batu Khan who then eventually established the Golden Horde which was an vast empire of Mongols who have settled these areas.