Táng Xiànzōng píngdìng le jǐ ge fānzhèn, shǐchēng Yuánhé Zhōngxīng.
Emperor Xianzong of Tang brought several regional governors to heel, which historians call the Yuanhe Restoration.
Tips
history
After the An Lushan rebellion (安史之乱, 755–763), military governors (藩镇) ran much of the north as their own. In the 元和 era Emperor Xianzong (唐宪宗) defeated several of them, but after his death in 820 the Hebei provinces broke away again.