During the Tang Zhenguan era (627-49 CE), Zhang Baocang was returning to Yueyang after ending his duty as Chief Secretary to the Imperial Guard, when he encountered a youth hunting and eating fresh meat in the wilds. Leaning against a tree he let out a long sigh and said: “Zhang Baocang is aged seventy and has never once had meat and wine like this; what a shame!” By his side there was a monk, who pointed and said: “Within sixty days, you will ascend to the third official grade; how is this something to sigh over?” When he finished speaking, he vanished. Baocang marvelled at this, and immediately returned to the capital. At that time Taizong (r. 626-49 CE) was suffering terribly with dysentery, and a crowd of physicians had no effect, so a decree was promulgated asking whether anyone in the court or retinue had the ability to treat the illness, promising them a rich reward. Baocang had once suffered from the same disease, so prepared a memorial to the throne in answer to the decree, prescribing beans simmered in milk. The emperor took it, and recovered instantly. A decree was passed down to the minister of state appointing him to the fifth official grade. Wei Wei obstructed this, so for more than a month he did not advance any plans. The emperor’s illness recurred, and he asked his retinue: “I previously took beans simmered in milk and this was effective.” He again ordered them to bring him forward, and after a single sip was cured once more. The emperor asked: “I had ordered to award him advancement to grade five, but have not seen him accept the post; why is this?” Wei was afraid, and said: “At the time the decree was issued, it was not clear whether this would be a military or civil branch of the clerks.” The emperor grew angry: “For governing we require a chancellor; we might as well appoint him to the third grade. I am the Son of Heaven; how can this not be up to me?” He therefore said in a loud voice: “Granted civil office in the third grade!” He stood and was appointed Minister for Protocol, and that was exactly sixty days later.
Li Rong 李冗, Du yi zhi 獨異志 (Outstanding Fantastic Stories), 上1.13 (Tale 74):
Li Rong 李冗, Du yi zhi, 獨異志 (Outstanding Fantastic Stories) in Du yi zhi, Xuanshi Zhi 獨異志，宣室志 (Outstanding Fantastic Stories, Stories from the Chamber of Dissemination), edited by Zhang Yongqin 张永钦 and Hou Zhiming 侯志明 (Beijing: Zhonghua shuju, 1983)