The yam or jam (Russian: ям), also called the örtöö (Mongolian: өртөө, lit. 'checkpoint'), was a Mongol postal system or supply point route messenger system. It was extensively used and expanded by Ögedei Khan and also used by subsequent khans and great khans.
The yam or jam (Russian: ям), also called the örtöö (Mongolian: өртөө, lit. 'checkpoint'), was a Mongol postal system or supply point route messenger system. It was extensively used and expanded by Ögedei Khan and also used by subsequent khans and great khans.
Source: Wikipedia "Yam (route)" · CC BY-SA 4.0
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