King Wu of Zhou granted Cao Xie (曹挾), an agnatic descendant of the Yellow Emperor through his grandson, the legendary emperor Zhuanxu, control of the small state of Zhu as a vassal ruler under the State of Lu with the feudal title Viscount (子), but later holding the title Duke of Zhu (邾公). The ancestral surname of the ruling family was Cao (曹).
The state of Zou was conquered and annexed by the state of Chu during the reign of King Xuan of Chu (r. 369–340 BC). The ruling family and its descendants adopted the Zhu (朱) surname in memory of their former state of Zhu (邾).
Interestingly, the noted Neo-Confucian Zhu Xi descends from the ruling house. The small state of Zou, however, is most famous as the birthplace of the Chinese philosopher Mencius. As the overlord State of Lu was the home state of Confucius and many of his disciples, this means that Confucianism's founder, and most of its minor sages and wise men hailed from or had ancestral roots in these two ancient states of China.
- Li, Xueqin (1985). Eastern Zhou and Qin Civilizations. Trans. Kwang-Chih Chang. Yale University Press. ISBN 0-300-03286-2. p. 144
- Li, Chi (1967). The Formation of the Chinese People. Russell & Russell. p. 138
- Tan, Thomas Tsu-Wee (1986). Your Chinese Roots. Times Books International. ISBN 0-89346-285-3. p. 239
- Wu, Kuo-Cheng (1982). The Chinese Heritage. Crown Publishers, Inc. ISBN 0-517-54475-X. p. 306
- Chao, Sheau-Yueh (2000). In Search of Your Asian Roots: Genealogical Research on Chinese Surnames. Clearfield. ISBN 0-8063-4946-8. p. 43