Ancient Chinese states (traditional Chinese: 諸侯國; simplified Chinese: 诸侯国; pinyin: Zhūhóu guó) were dynastic polities of China within and without the Zhou cultural sphere prior to Qin's wars of unification. They ranged in size from large estates, to city-states to much vaster territories with multiple population centers. Many of these submitted to royal authority, but many did not—even those that shared the same culture and ancestral temple surname as the ruling house. Prior to the Zhou conquest of Shang, these ancient states were already extant as units of the preceding Shang dynasty, Predynastic Zhou or polities of other cultural groups. Once the Zhou had established themselves, they made grants of land and relative local autonomy to kinfolk in return for military support and tributes, under a system known as fengjian.
The rulers of the states were collectively the zhuhou (諸侯; 诸侯; zhūhóu; 'many lords'). Over the course of the Zhou dynasty (c. 1046–256 BCE), the ties of family between the states attenuated, the power of the central government waned, and the states grew more autonomous. Some regional rulers granted subunits of their own territory to ministerial lineages who eventually eclipsed them in power and in some cases usurped them. Over time, the smaller polities were absorbed by the larger ones, either by force or willing submission, until only one remained: Qin (秦), which unified the realm in 221 BCE and became China's first imperial dynasty.
