Classics: Classics refer to Confucian classics; History: historical books, that is, official history; Zi: Hundreds of works in the pre-Qin period, religion; Collection: Poetry. Generally refers to the ancient classics of China. Source: The Book of the New Tang Dynasty: "Each of them has four books, followed by A, B, C and D, which are listed in the four databases of the subset of classics and history." Example: Just say one word from my sister, it doesn't matter ~, and everyone will continue to be numb in turn. Qing Li's "Jing Hua Yuan" back to the seventy-eighth
"Subsets of Classics and History" are four categories of ancient books in China. Some large-scale ancient books series often include four books and are named after them, such as Four Ku Quanshu, Four Series and Four Essentials. It can be seen that the four categories are of great significance to ancient books.