Pei Songzhi (372–451), courtesy name Shiqi, was a historian and politician who lived in the late Eastern Jin dynasty and the Liu Song dynasty. His ancestral home was in Wenxi, Hedong (present-day Wenxi County, Yuncheng, Shanxi) but he moved to the Jiangnan region later. Pei is best known for making annotations to the historical text Records of the Three Kingdoms written by Chen Shou in the 3rd century, providing additional details omitted from the original work. His commentary, completed in 429, became integral to later editions of Records of the Three Kingdoms, making the joint work three times as long as the original. Two of his descendants, Pei Yin (裴駰) and Pei Ziye (裴子野), were also well known historians.