秦献公 / Duke Xian of Qin

秦献公 / Duke Xian of Qin appears in 《资治通鉴·周纪》10丨 以家族单位 有蚂蚁吃大象的精神（1） as the 秦国 ruler visited by 太史旦. The source uses him as the audience for a speech about Zhou-Qin common origin, reunion after five hundred years, and a later hegemon.

The host’s reading makes Qin Xian Gong less a biography subject than a strategic target. If 周王室 wanted to counter the usurpations of Sanjin and Tian-family Qi, Qin was a plausible power to flatter and recruit through kinship legitimacy diplomacy.

Connections

• 秦国 - polity he rules.
• 太史旦 and 《史记》 - visitor and source passage.
• 周王室 and Kinship Legitimacy Diplomacy / 同源合法性外交 - political interpretation in the episode.
• Yin-Yang Five-Phases Political Theory / 阴阳五行政治理论 - adjacent legitimacy language around the number five.