Temüjin was proclaimed Chinggis Khan at a quriltai, marking the start of an empire that soon required reliable long-distance communications. Early Mongol rule relied on mounted messengers and improvised supply support that later developed into the formal yam relay network.
Ögedei’s election as Great Khan created the administrative capacity and imperial authority needed to regularize empire-wide systems—most notably the postal relay (yam) and related documentation practices.
Ögedei is widely credited with organizing a standardized yam network across the empire (commonly dated to 1234): relay stations with permanent staff, spaced roughly an average day’s ride apart, supplying fresh mounts, rations, and lodging for authorized couriers and envoys.
To keep the relay network supplied, relay stations drew on designated households and local obligations (animals, fodder, carts, provisions). This institutionalized communications as a state function, but also created recurring tensions over requisitions and abuse by unauthorized travelers.
Because paiza (authority tablets) and jarliqs (edicts) could be abused to compel services—including access to the yam—Ögedei is reported to have prohibited nobles from issuing them, aiming to reduce exploitation of civilians and impose central control over credentials.
The Franciscan mission led by Giovanni da Pian del Carpine reached the Mongol court and attended Güyük Khan’s enthronement (24 Aug 1246). Such missions documented the practical realities of Mongol travel and provisioning, including reliance on official posts and relay support along long-distance routes.
Möngke Khan pursued fiscal and administrative tightening, prohibiting certain merchant groups (including those linked to ortoq partnerships) from using the imperial relay stations and paiza, and sending investigators—an effort to reduce corruption and protect the relay system’s capacity for state needs.
Later Yuan-era discussions attribute to Kublai (Zhongtong 1, 1260) an edict encouraging the establishment of delivery shops and post offices, reflecting further institutionalization of rapid communications within Yuan territory alongside the wider Mongol yam tradition.
Kublai’s rise intensified the use of formal institutions in East Asia, including communications and transport administration. Under the emerging Yuan regime, Mongol relay practices interfaced with long-standing Chinese bureaucratic approaches to stations, documentation, and logistics.
Paiza tablets functioned as travel-and-supply credentials enabling authorized officials and envoys to claim provisions (including relay support). Their use illustrates how imperial communications depended on documented authorization rather than open access, even as abuse persisted.
Travel narratives associated with the Yuan period describe an extensive system of stations providing mounts, lodging, and supplies—evidence of the yam’s maturity as an operational backbone for governance, intelligence movement, and long-distance travel under Mongol rule.
In the Ilkhanate, Ghazan introduced reforms that included standardized edict forms and recordkeeping, cancellation of older jarliqs, and reworked paiza rules (including bearer identification). He also restricted routine use of the staffed postal relay to urgent state needs—measures aimed at reducing fraud and overuse of the relay network.
After the Mongol period, successor states (notably the Ming in China) maintained and adapted postal-station institutions that had operated under the Yuan, showing the yam’s long administrative afterlife in East Asia’s state communications and transport systems.
The Yam Postal Relay System and Imperial Communications (c. 1206–14th century)
