Drogön Chögyal Phagpa
The Phags-pa script was an alphabet designed by the Tibetan Lama Zhogoin Qoigyai Pagba (Drogön Chögyal Phagpa) for Yuan emperor Kublai Khan, as a unified script for the literary languages of the Yuan Dynasty. The Phags-pa script has helped reconstruct the pronunciation of pre-modern forms of Chinese but it totally ignores tone.