Li Si
This realignment in Confucian thought was parallel to the development of Legalism, which saw filial piety as self-interest and not a useful tool for a ruler to create an effective state. A disagreement between these two political philosophies came to a head in when the Qin state conquered all of China. Li Si, Prime Minister of the Qin dynasty, convinced Qin Shi Huang to abandon the Confucians' recommendation of awarding fiefs akin to the Zhou Dynasty before them which he saw as being against to the Legalist idea of centralizing the state around the ruler. When the Confucian advisers pressed their point, Li Si had many Confucian scholars killed and their books burned—considered a huge blow to the philosophy and Chinese scholarship.