Title: Tō Sō no henkaku to kanryōsei
Subjects: History, Politics and government, Bureaucracy, Chūgoku-Rekishi-Tō jidai, Chūgoku-Rekishi-Sō jidai, Kanryōsei
Places: China
Time periods: Tang dynasty, 618-907, Song dynasty, 960-1279, 581-907, 907-979, 960-1279