Sima Zhen

Not to be confused with Sima Qian.

In this Chinese name, the family name is Sima (Ssu-ma).

Sima Zhen (Chinese: 司馬貞; Wade–Giles: Ssu-ma Chen; 679–732), courtesy name Zizheng (Tzu-cheng; 子正), was a Tang dynasty Chinese historian born in what is now Jiaozuo, Henan.

Sima Zhen
Traditional Chinese	司馬貞
Simplified Chinese	司马贞
Transcriptions Standard Mandarin Hanyu Pinyin Sīmǎ Zhēn Wade–Giles Ssu1-ma3 Chen1

Sima Zhen was one of the most important commentators on the Shiji.^[1] His commentary is known as the Shiji Suoyin (史記索隱), which means "Seeking the Obscure in the Records of the Grand Historian".^[2]