Final answer:
The Treaty of Paris was not a serious diplomatic mission of the thirteenth century, unlike the Crusades, Silk Road expeditions, and Mongol invasions.
Step-by-step explanation:
The Treaty of Paris was not a serious diplomatic mission of the thirteenth century. The other options listed were all significant events or missions during this time period:
- The Crusades: These were a series of military campaigns led by European Christians to recapture the Holy Lands from Muslims.
- The Silk Road expeditions: These were trade expeditions that connected Europe with Asia, allowing for cultural exchange and the trade of goods.
- The Mongol invasions: The Mongols, led by Genghis Khan, established a vast empire through military conquests, spreading across Eurasia.