Khubilai Khan commissioned the Chinese painter Liu Guandao to produce this depiction of him as "the Emperor and Great Khan" on a hunt. Hunting was a quintessential Mongol activity that was originally designed as training for warfare.
Liu Guandao's depiction of Khubilai in this work (the figure in the white, fur-tipped robe in the central foreground) confirms Marco Polo's descriptions of the emperor as an aging and obese man.
Commissions such as these are a good indication of the Mongols' dedication to artistic partonage.
About the artist Liu Guandao:
Hills Beyond a River, by James Cahill (New York: Weatherhill, 1976)