嬴驷 / Ying Si

嬴驷 / Ying Si appears in 《资治通鉴·周纪》13丨 公孙鞅苛刻变法惹杀身（1） as 秦孝公’s crown prince. The episode introduces him at the endpoint, after 公孙鞅 / 商鞅’s new law has been active for more than a year and public complaints have accumulated.

The source uses Ying Si as a suspense point rather than a full biography. His violation of the new law turns 商鞅变法 from a general policy program into a legitimacy test: if the law does not reach the ruler’s heir, the reform loses credibility; if it does, it threatens the court’s highest-status people.

Connections

• 秦孝公 - his father and Qin ruler in the episode.
• 公孙鞅 / 商鞅 - reformer whose law he violates.
• 秦国 - state whose new legal order is being tested.
• Shang Yang Reforms / 商鞅变法, Legalist Ruler Technique / 法家君术, and Warring States Reform Backlash / 战国变法反噬 - concepts made concrete by the prince’s case.