Batu Khan (c. 1207-1255) was a Mongol ruler and founder of the Ulus of Jochi (or Golden Horde); the sub-khanate of the Mongol Empire. Batu was a son of Jochi and grandson of Genghis Khan. His ulus was the chief state of the Golden Horde (or Kipchak Khanate); which ruled Rus and the Caucasus for around 250 years; after also destroying the armies of Poland and Hungary. After the deaths of Genghis Khan's sons; he became the most respected prince called agha (elder brother) in the Mongol Empire.