Zeng Guo, one of the vassal States of the Zhou Dynasty, surnamed Ji, was a fief given by the Zhou Emperor to the descendants of Nangong, also known as Nangong fief, belonging to the feudal state of Hanshui. Zeng Guo, known as Sui State in history books, existed from the period of Chengkang in the Western Zhou Dynasty to the end of the Warring States Period.
The founding monarch Zeng Guo, whose name is Nangong Kuo, assisted Zhou Wenwang and Zhou Wuwang successively, and was enfeoffed by Zhou Chengwang for his outstanding achievements; The establishment of the State of Zeng was an important part of the strategy of the Western Zhou Dynasty's Great Expedition to the South, which realized the effective control of Jianghan area by the Zhou Dynasty. At the end of the Spring and Autumn Period, He Lv, the king of Wu, attacked Chu and captured Ying, the capital of Chu. King Chu Zhao fled to the country of Zeng (that is, following the country, seeing the mystery of Zeng) and was protected by the country of Zeng. The history of Zeng Guo is rare in handed down literature. According to the latest research on Yejiashan cemetery in Suizhou in the late Shang and Zhou Dynasties, Zeng Guo only existed in the floating basin in Suizhou in the early Western Zhou Dynasty. However, with the destruction of Hubei by the Emperor of Zhou, Zeng quickly expanded to Northern Han and Xinye, Henan, becoming the largest country in the Eastern Han Dynasty, replacing Hubei.