Bao Xun

Bao Xun , courtesy name Shuye, was a general and politician of the state of Cao Wei during the Three Kingdoms period. He was appointed as a minister by Cao Cao in recognition of his late father Bao Xin, who was killed in action against the Yellow Turban rebels. Bao Xun was known to be an outspoken minister who would not hesitate to criticise anyone for their mistakes, including his lord. Cao Caos successor Cao Pi was frustrated and angry with Bao Xun for his outspoken nature that he demoted Bao several times during his reign. Eventually, Cao Pi grew tired of Bao Xun and ordered Baos execution.

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Source: Wikipedia