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来自维基百科,自由的百科全书
贞元(785年正月—805年八月)是唐德宗的第三个年号,共计21年。[1]唐德宗最初拟定的年号是“元庆”和“天元”,后采用宰相李泌的建言,从唐太宗年号贞观和唐玄宗年号开元各取一字合二为一,成为新年号“贞元”。[2][3]
贞元二十一年
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