司马防 / Sima Fang (late Han)
司马防 / Sima Fang enters the wiki through Hanji 904 as the shangshu youcheng who recommends nineteen-year-old 曹操 for the north commandant post in 洛阳. The source says he had previously served as Luoyang magistrate, so he understands the capital’s difficult enforcement environment and judges Cao Cao’s forceful temperament as a fit for it.
His function is narrower than a full Sima-family biography. In this episode, Sima Fang turns reputation and family access into concrete office placement: after 桥玄 sends Cao Cao to 许劭, Sima Fang makes Cao Cao’s early reputation actionable through appointment.