Emperor Wu of Han's early reign saw the creation of a series of posts for academicians in 136 BC. Ardently promoted by Dong Zhongshu, the Taixue and Imperial examination came into existence by recommendation of Gongsun Hong, chancellor under Wu. Officials would select candidates to take part in an examination of the Confucian classics, from which Emperor Wu would select officials to serve by his side. Gongsun intended for the Taixue's graduates to become imperial officials but they usually only started off as clerks and attendants, and mastery of only one canonical text was required upon its founding, changing to all five in the Eastern Han. Starting with only 50 students, Emperor Zhao expanded it to 100, Emperor Xuan to 200, and Emperor Yuan to 1000.