Yuè Fēi (岳飞), AD 1103 - 1142, was one of the most famous patriot, martyr and hero in Chinese history.
His death engineered by the Emperor GaoZong of Song and minister Qin Kuai (秦桧) is well known.
However, I personally find the actual charge of Mò Xū You (莫须有) to be the most hard to understand.
This was besides the earlier fabricated accusations made against him by Qin Kuai's cronies such as Imperial Inspector Moqi Xie (万俟卨) which charged him with failure to act when the Jurchens attacked Huai Xi (淮西) as well as withdrawing from numerous battlegounds, and another by former superior Zhang Jun (张俊), former subordinates Wang Gui (王贵) and Wang Jun (王俊) accusing him of trying to make use of subordinate Zhang Xian (张宪) to seize the city of XiangYang (襄阳).
I have encountered different explanations for the term Mò Xū You in the Chinese language and the English language, but none were satisfactory.
Of course, I accept that all charges against Yue Fei were triumphed-up in the first place, but I thought at least some decorum of form was observed even by the Emperor and Qin Kuai. Qin Kuai might be a villain, but he was far from being stupid.
One explanation as given in Chinese (website 杨周:鹿象辩论--中国千年大悲剧(七)) was Yue Fei was guilty of disobeying the recall order until 12 "golden tablets" had to be despatched. Yue Fei's explanation that a general commanding an away force had the discretion to decide how to respond to the ruler's order (将在外, 君命有所不受) was deemed "unacceptable".
It was the unacceptability of that excuse that was the actual Mò Xū You. Qin Kuai was saying that Yue Fei's initial non-compliance with the recall order had no legal basis.
Due to the unpopularity of the action, the meaning of Mò Xū You became synonymous with "not guilty" (无罪名), and its original meaning forgotten.
It was actually not certain if Yue Fei even used the excuse of being a general in distant command. Nor was there any real proof that he intended to defy the recall order. Strictly speaking, the phrase (将在外, 君命有所不受) itself was a conventional wisdom rather than appear in any written military regulation, at least at the era.
Subsequently, another explanation arose for Mò Xū You as "Not Necessarily There" (不必有), which was derived from a very literal character by character reading of 莫须有. This was an outright abuse of power on the part of the lord towards the subject.
Yet a third explanation (website "莫须有"的罪名) arose that the term Mò Xū You was the pretext given by Qin Kuai to General Han ShiZong (韩世忠) who questioned the existence of evidence against Yue Fei's conspiring with Zhang Xian. Qin Kuai meant that the lack of evidence might not mean innocence. In other words, it is presumed guilt. The catch was it was practically impossible to prove innocence because there was no definite detail of what the guilt was or how to prove something did not exist.
Does any one know the actual charges made against Yue Fei and the original meaning of Mò Xū You (莫须有)?

