#OTD in #MedievalChina: Li Longji 李隆基/ Xuanzong 玄宗 (r. 712–56) of Tang 唐 and his crown prince, Li Heng 李亨 / Suzong 肅宗 (r. 756–62) quit the Western capital Chang'an 長安 for Chendu 成都 in flight from the rebel armies of the An Lushan Rebellion 安史之亂.