春秋左氏伝
This "Zuo Qiuming" whom Sima Qian references was traditionally assumed to be the Zuo Qiuming who briefly appears in the "Analects of Confucius" ("Lunyu" 論語) when Confucius praises him for his moral judgment. Other than this brief mention, nothing is concretely known of the life or identity of the Zuo Qiuming of the "Analects", nor of what connection he might have with the "Zuo Zhuan". But this traditional assumption that the title's "Master Zuo" refers to the Zuo Qiuming of the "Analects" is not based on any specific evidence, and was challenged by scholars as early as the 8th century. Even if he is the "Zuo" referenced in the "Zuo Zhuan"′s title, this attribution is questionable because the "Zuo Zhuan" describes events from the late Spring and Autumn period (c. 771–476) that the Zuo Qiuming of the "Analects" could not have known.