Mongol Postal Relay System (Yam)

Timeline

1. 1321–1325Post road from the Yuan dynasty to the Ilkhanate · Central AsiaAlthough the Mongol Empire had split into several khanates, the Yuan dynasty and Ilkhanate still exchanged envoys and documents through the jam system, with relay stations providing horse changes and en-route supplies to maintain an official transport corridor across Eurasia.
2. 1326–1330Relay stations of the Volga basin · Russian SteppeThe Golden Horde maintained a relay station network along the Volga River and the Steppe Road, providing horses and escorts for merchants and envoys, keeping the northern Silk Road branch and Black Sea port trade open in the early 14th century.