Drogön Chögyal Phagpa
The Phags-pa script is an alphabet designed by the Tibetan monk and State Preceptor (later Imperial Preceptor) Drogön Chögyal Phagpa for Kublai Khan, the founder of the Yuan dynasty, as a unified script for the written languages within the Yuan. The actual use of this script was limited to about a hundred years during the Mongol-led Yuan dynasty, and it fell out of use with the advent of the Ming dynasty.