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来自维基百科,自由的百科全书
北周以前,有封國的公爵(包括開國郡公、開國縣公、禪代前權臣所封的公爵等)都可稱「國公」,但此時「國公」並不是一種爵位。例如:
北周始置國公一爵,居於郡公、縣公之上。按唐制:郡王與國公並為從一品。自隋唐至元明,基本不變。有許多名臣都被授予國公的爵位,如:
清朝公爵分一至三等,超品,只加美號,不加國號、邑號,如忠勇一等公。
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