There is a theory that Mongolian horseman may have invented ice cream, when they took cream in containers made from animal intestines as provisions on long journeys across the Gobi desert in winter. As they galloped, the cream was vigorously shaken, while the sub-zero temperature caused it to freeze. The expansion of the Mongol Empire spread ice cream through China, from where Marco Polo reputedly brought the idea to Italy when he returned from his travels in 1295.