孝經
The last half of the 2nd century BC was the period when new versions of the Confucian classics were discovered. Most of these new versions were found in the walls of Confucius’s old residence in Qufu, the old capital of State of Lu, when Prince Liu Yu (d. 127 BC) attempted to expand it into a palace upon taking the throne there. In the course of taking the old wall apart, the restorers found old versions of the "Classic of History", "Rites of Zhou", "Yili", "Analects of Confucius" and "Classic of Filial Piety", all written in the old orthography used prior to the reforms of the Clerical script. Hence they were called “old texts”. These newly discovered editions had an effect on later Confucianism.