Zhou were first mentioned in ancient Chinese texts, notably the
Yu Gong or
Tribute of Yu, section of the
Book of Documents. All agreed on the division of China into
nine zhou, though they differed on their names and position. These
zhou were geographical concepts, not administrative entities. The
Han dynasty was the first to formalize the
zhou into actual administrative divisions by establishing
13 zhou all across China. Because these
zhou were the largest divisions of the China at the time, they are usually translated as "provinces". After the Han dynasty, however, the number of
zhou began to increase. By the time of the
Sui dynasty, there were over a hundred
zhou all across China. The Sui and Tang dynasties merged
zhou with the next level down, the
commanderies or (). The Tang also added another level on top: the
circuit or (). Henceforth,
zhou were lowered to second-level status, and the word becomes translated into English as "prefecture". Thereafter,
zhou continued to survive as second- or third-level political divisions until the
Qing dynasty. The
People's Republic of China recycled the name, using it to refer to the
autonomous prefectures granted to various ethnicities. == See also ==