The political importance and popularity of Confucius and Confucianism grew throughout the Han dynasty, and by the Eastern Han the "Analects" was widely read by schoolchildren and anyone aspiring to literacy, and often read before the Five Classics themselves. During the Eastern Han, the heir apparent was provided a tutor specifically to teach him the "Analects". The growing importance of the "Analects" was recognized when the Five Classics was expanded to the "Seven Classics": the Five Classics plus the "Analects" and the "Classic of Filial Piety", and its status as one of the central texts of Confucianism continued to grow until the late Song dynasty (960–1279), when it was identified and promoted as one of the Four Books by Zhu Xi and generally accepted as being more insightful than the older Five Classics.