The first recorded issue of paper money in the Mongol Empire. "From 1260, when Kublai Khan completed the conquest of China and took the title of emperor, the issue of paper money became a settled and permanent feature of the Mongol government's financial policy. . . . Records have been preserved showing year by year the amount of notes issued through Kublai's reign and that of his successors for ninety-seventy years (1260-1356)" (Carter, Invention of Printing in China 2nd ed  107).
"Paper money was the first form of Chinese printing met with by European travelers, was independently discussed by at least eight pre-Renaissance European writers, and, so far as is known, is the only form of Chinese printing described in European writings of pre-Gutenberg days. Marco Polo's description is the most detailed" (Carter, op. cit., 109).