Ancient books refer to texts that were written or published during ancient times, typically dating back thousands of years. These books encompass a wide range of literary, historical, philosophical, and religious works. They are considered valuable sources of knowledge and wisdom, often providing insights into the culture, society, and thought processes of ancient civilizations.

Some famous ancient Chinese books include:

The Four Great Classical Novels: These are considered the pinnacle of Chinese literature and include "Water Margin" （Shui Hu Zhuan）, "Romance of the Three Kingdoms" （San Guo Yan Yi）, "Journey to the West" （Xi You Ji）, and "A Dream of Red Mansions" （Hong Lou Meng）.

Classical Chinese Literature: This includes works such as "The Spring and Autumn Annals" （Chun Qiu）, "Historical Records" （Shi Ji）, "The Book of Songs" （Shi Jing）, "The Book of History" （Shu Jing）, "The Book of Changes" （I Ching）, "The Book of Rites" （Li Ji）, and "The Great Learning" （Da Xue）.

Philosophical Texts: Important philosophical works include "The Analects of Confucius" （Lunyu） and "Mencius" （Mengzi）, which are essential for understanding Confucian thought.

Other Notable Works: Other ancient books include "The Classic of Mountains and Rivers" （Shan Hai Jing）, a geographical and mythological text, and "Bencao Gangmu" （Ben Cao Gang Mu）, a comprehensive medical compendium.

When describing ancient books in English, it is common to use terms such as "ancient texts," "classic literature," "philosophical works," or "historical records." These terms help convey the significance and timeless value of these ancient texts.