What is the origin of the "left" surname?

The Zuo family in Jiyang County can be divided into left historians and right historians in the Zhou Dynasty. Among the left and right attendants, Lu Zhishen in the Spring and Autumn Period had the name of Left. The descendants of these historians are generally divided into surnames according to their official positions, so they have left surnames. You must have heard of the book Zuo's Spring and Autumn Annals, which records the political, economic, military, diplomatic and cultural aspects of the vassal states in the Spring and Autumn Period. Exceptionally, in the Spring and Autumn Period, the Qi clan had left and right sons, and the descendants of Zuo Gongzi took Zuo as their surname, also known as Zuo's. There are many celebrities in the Zuo family, such as Zuo.