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来自维基百科,自由的百科全书
貞元(785年正月—805年八月)是唐德宗的第三個年號,共計21年。[1]唐德宗最初擬定的年號是「元慶」和「天元」,後採用宰相李泌的建言,從唐太宗年號貞觀和唐玄宗年號開元各取一字合二為一,成為新年號「貞元」。[2][3]
貞元二十一年
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