公爵
公爵是用来翻译欧洲中世纪贵族等级系统中相应等级个称号（例如英语Duke、德语Herzog、法语Duc等）。
公起源于中国周代分封建国制度下个诸侯五等爵体系，为第一等爵，具有明确个尊卑等级搭对应个权责。“爵”，是一种酒器，多为青铜所制，是西周礼器中个一种。
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