For the past eight hundred years, the study of Confucian doctrine has been largely dominated by the crucial works known as the "Four Books" the Analects, the Mencius, the Daxue, and the Zhongyong. In their original forms, the Daxue and Zhongyong were two of the more than forty chapters of the larger Li ji (Book of Rites), only gaining prominence thanks to the Song Neo-Confucian scholar Zhu Xi.