Never especially culturally dogmatic, the Mongols had eagerly harvested technologies and customs from the lands they had visited: Chinese shipbuilders and Persian siege engineers had been co-opted into the military. Uighur scribes had been drafted into government administration, and a new official script was adopted for bureaucracy across the empire. In 1227 Genghis issued a paper currency, copied from the defeated Jin dynasty of China, backed by silver and silk.
