Chuanqi is a form of fictional short story in Classical Chinese first formed in the Tang dynasty. The term often refers specifically to fictions written in the Tang dynasty, in which case the fictions are also called Tang chuanqi or chuanqi wen. Chuanqi originated from the Zhiguai xiaoshuo of the Six Dynasties, was first formed in Early Tang dynasty, became popular in Middle Tang and dwindled in the Song dynasty. Chuanqi has four main themes: love, gods and demons, xiayi (heroes and knights-errant) and history. Well known works of chuanqi include The World Inside a Pillow and Renshi zhuan (The Story of Lady Ren) by Shen Jiji, Yingying's Biography by Yuan Zhen, The Tale of Huo Xiaoyu by Jiang Fang, The Tale of Li Wa by Bai Xingjian, The Governor of Nanke by Li Gongzuo, Chang hen ge zhuan by Chen Hong, Hongxian zhuan by Yuan Jiao and The Tale of the Curly-Bearded Guest by Du Guangting. Unlike general Biji xiaoshuo and Zhiguai xiaoshuo, most chuanqi stories have a complicated plot with twists and detailed descriptions and are meaningful literary creations instead of mere recordings of factual events. They are some of the earliest Chinese literature written in the form of short stories and have provided valuable inspiration plot-wise and in other ways for fiction and drama in later eras. Many were preserved in the 10th-century anthology, Taiping Guangji (Extensive Records of the Taiping Era). Referring to fictions written in the Tang dynasty as chuanqi is established by usage. In the early 1920s the prominent author and scholar Lu Xun prepared an anthology of Tang and Song chuanqi which was the first modern critical edition of the texts and helped to establish chuanqi as the term by which they are known. There is no clear definition of chuanqi, and there are debates regarding what fictions precisely should be included as chuanqi. Some scholars have argued that it is not to be used as a general term for all Tang dynasty stories.