Fēngjiàn () was a governance system in ancient China, whose social structure formed a decentralized system of confederation-like government. The ruling class consisted of the Son of Heaven (king) and aristocracy, and the lower class consisted of commoners categorized into four occupations (or "four categories of the people", namely scholar-officials, peasants, laborers and merchants). Elite bonds through affinal relations and submission to the overlordship of the king date back to the Shang dynasty, but it was the Western Zhou dynasty when the Zhou kings enfeoffed their clan relatives and fellow warriors as vassals. Through the fengjian system, the king would allocate an area of land to a noble, establishing him as the ruler of that region and allowing his title and fief to be legitimately inherited by his descendants. This created large numbers of local domains, which became autonomous states.
Zhou dynasty nobility
The rulers of these vassal states, known as zhūhóu (), had a political obligation to pay homage to the king, but as the central authority started to decline during the Eastern Zhou dynasty, their power began to outstrip that of the royal house and subsequently the states developed into their own kingdoms, reducing the Zhou dynasty to little more than a prestigious name. As a result, Chinese history from the Zhou dynasty (1046 BC–256 BC) to the beginning of the Qin dynasty has been termed a feudal period by many Chinese historians, due to the custom of enfeoffment of land similar to that in Medieval Europe. However, scholars have suggested that fengjian otherwise lacks some of the fundamental aspects of feudalism. This system is often conflated with Confucianism and also with Legalism.
Each fengjian state was autonomous and had its own tax and legal systems along with its own unique currency and even writing style. The nobles were required to pay regular homage to the king and to provide him with soldiers in a time of war. This structure played an important part in the political structure of the Western Zhou which was expanding its territories in the east.