Ming dynasty
Province, prefecture, sub-prefecture and county

Described as "one of the greatest eras of orderly government and social stability in human history" by Edwin O. Reischauer, John K. Fairbank and Albert M. Craig, the Ming emperors took over the provincial administration system of the Yuan dynasty, and the thirteen Ming provinces are the precursors of the modern provinces. Throughout the Song dynasty, the largest political division was the circuit (lu 路). However, after the Jurchen invasion in 1127, the Song court established four semi-autonomous regional command systems based on territorial and military units, with a detached service secretariat that would become the provincial administrations of the Yuan, Ming, and Qing dynasties. Copied on the Yuan model, the Ming provincial bureaucracy contained three commissions: one civil, one military, and one for surveillance. Below the level of the province (sheng 省) were prefectures (fu 府) operating under a prefect (zhifu 知府), followed by subprefectures (zhou 州) under a subprefect. The lowest unit was the county (xian 縣), overseen by a magistrate. Besides the provinces, there were also two large areas that belonged to no province, but were metropolitan areas (jing 京) attached to Nanjing and Beijing.
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