1. Both the Pax Romana and the Mongol Empire were periods of relative peace and stability in their respective regions.
2. Pax Romana was a period of peace and prosperity in the Roman Empire that lasted for over 200 years, while Pax Mongolica was a period of peace and prosperity in the Mongol Empire that lasted for over 100 years.
3. Both periods were marked by increased trade and cultural exchange between different regions and peoples.
4. Both empires had a strong central authority that was able to maintain law and order and prevent major wars.
5. Pax Romana and Pax Mongolica were both established through military conquest and were maintained through a combination of military power and diplomacy.
6. Both empires had a system of驛站 (stations), which were used to facilitate communication and transportation. This allowed for the rapid movement of troops and supplies, as well as the exchange of goods and ideas over large distances.