Who visited china and won friendship of kublia khan?

Did people in the middle ages leave their village often? What were the main reasons for the Romans success in controlling such a large emprire? Who wrote romulous and Remus? Who invented moveable type printing press? What countries were under western influence after World War 2? When did Kingdom Crusade happen? What do the letters CE and BCE mean? Which crusade was the least successful and why? What do they use corn for in medieval times? Who the European explorer that inroduced culture to china in the 1200s? What was the Purpose Of Early Portuguese Exploration? How many days are in 500 years? Where did the Kiowa people migrate to from Montana in the 1600s? Was Ehrlich's discovery of salvarsan 606 a turning point in the history of medicine? How did the fourth crusade to the Byzantine empires downfall? What is the person called who received land in exchange for support in a feudal system? Who reformed the roman army? What was the purpose to the Round Table? What year did the 21st century begin? The withdrawal of Roman armies from Britain enabled?