A written language:
The Mongols did not have a written language until nearly the Middle Ages.
Much of what we know about the customs and beliefs of these ancient people comes to us from their oral legends, myths, riddles, and proverbs.
Gifts the ancient Mongols gave the world:
Appliqué
Whistle Arrows
Gers
Salty Tea
Horse Head Fiddle (Morin Khuur)
Many great stories and legends