#DOTD: Li Shimin 李世民 (598/9–649), Taizong 太宗 (r. 626–49), co-founder of the Tang 唐 (618–907) and one of the most celebrated emperors of imperial China. He's often seen as a model #Confucian ruler. #貞觀之治 #帝範 #MedievalTwitter #TwitterHistorians #Empire