Chinese literature is based on the literature of the Zhou dynasty. Concepts covered within the Chinese classic texts present a wide range of thoughts and subjects including calendar, military, astrology, herbology, geography and many others. Some of the most important early texts include the ''I Ching'' and the ''Shujing'' within the Four Books and Five Classics which served as the Confucian authoritative books for the state-sponsored curriculum in dynastic era. Inherited from the ''Classic of Poetry'', classical Chinese poetry developed to its floruit during the Tang dynasty. Li Bai and Du Fu opened the forking ways for the poetic circles through romanticism and realism respectively. Chinese historiography began with the ''Shiji'', the overall scope of the historiographical tradition in China is termed the Twenty-Four Histories, which set a vast stage for Chinese fictions along with Chinese mythology and folklore. Pushed by a burgeoning citizen class in the Ming dynasty, Chinese classical fiction rose to a boom of the historical, town and gods and demons fictions as represented by the Four Great Classical Novels which include ''Water Margin'', ''Romance of the Three Kingdoms'', ''Journey to the West'' and ''Dream of the Red Chamber''. Along with the wuxia fictions of Jin Yong and Liang Yusheng, it remains an enduring source of popular culture in the East Asian cultural sphere.