Du You (Chinese: 杜佑; pinyin: Dù Yòu; Wade–Giles: Tu Yu) (735 – December 23, 812), courtesy name Junqing (君卿), formally Duke Anjian of Qi (岐安簡公), was a Chinese scholar, historian and chancellor of the Tang Dynasty, who devoted thirty-six years to the compilation of the Tongdian, a historical encyclopedia with 200 sections (volumes), a collection of laws, regulations, and general events from ancient times to his own. He was born to an official family in what is now Xi'an, Shaanxi, almost eighteen years before the abrupt rebellion of An Lushan. Du was "a political thinker on a grand scale," comparable to Ibn Khaldun, according to Robert G. Hoyland.
Read more about Du You: Background, During Emperor Dezong's Reign, During Emperor Shunzong's and Emperor Xianzong's Reigns, Writing of The Tongdian
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... Du You had been impressed by a 35-volume work by Liu Zhi during Emperor Xuanzong's reign known as the Zhengdian, which was a compendium of philosophies ... However, Du considered the Zhengdian to be incomplete, so he expanded on the coverage of the Zhengdian and added writings about the rites, music, and written works of Emperor Xuanzong's time ...