Since the Han dynasty, Chinese readers have interpreted the "Analects" by reading scholars' commentaries on the book. There have been many commentaries on the "Analects" since the Han dynasty, but the two which have been most influential have been the "Collected Explanations of the Analects" ("Lunyu Jijie") by He Yan (c. 195–249) and several colleagues, and the "Collected Commentaries of the Analects" ("Lunyu Jizhu") by Zhu Xi (1130–1200). In his work, He Yan collected, selected, summarized, and rationalized what he believed to be the most insightful of all preceding commentaries on the "Analects" which had been produced by earlier Han and Wei dynasty (220–265 AD) scholars.