司马贞 / Sima Zhen
司马贞 / Sima Zhen enters the wiki through 《资治通鉴·秦纪》114-3｜荆轲刺秦为何久久不行动？在等谁？ as the Tang historian cited for the note that 徐夫人 is a male name in the 荆轲 dagger story. The episode uses the note to prevent a mistaken gender reading and to connect Xu Furen with an especially sharp dagger.
In this source, Sima Zhen’s role is not an independent argument about 《史记》; it is a clarifying commentator note inside the assassination-preparation narrative.