Li Jing (570-649 AD), Tang Dynasty general and purported author of "Duke Li of Wei Answering Emperor Taizong of Tang" 唐太宗李衛公問對 Táng Tàizōng Lǐ Wèi Gōng Wènduì, one of the Seven Military Classics of ancient China 武經七書 Wǔjīng Qīshū