The purpose of this article is to describe and discuss how Lu Chia-Hsing (盧嘉興, 1918-1992), a self-taught folk historian and researcher, excavated a piece of the history and memory of the Ping-pu tribe from a tombstone in the Left Town Public Cemetery in Tainan. While the academic community has accumulated considerable research on how historical memory has been shaped, replicated, and represented since the Japanese colonial period until after World War II, there is little discussion of how fragmented historical memory can be reconnected. It is a highly worthwhile topic to explore how local activists find, organize, analyze, and write historical knowledge that has already been forgotten or even erased, to preserve it as empirical and knowledge-bearing evidence. In Lu’s article written in 1982, he not only describes the process of historical research on the tombstone inscription, but also provides material for recording the interactions of local knowledge networks. The article not only establishes the historical evidence that the couple buried in the tomb were from the Ping-pu tribe and were local leaders, but also records the author’s reasoning process. From his interactions with local collectors of cultural relics, such as Chen Chun-mu(陳春木), and the records of his contacts with the descendants of the Li family, it can be observed how local folk history communities formed the context of historical knowledge through collective collaboration. This article will explore Lu’s personal learning process and narrative characteristics from this article as a clue, and from his interactions with Wu Hsin-Jung(吳新榮) in the 1950s and 1960s, we will explore how folk historians collaborate with communities to excavate local historical memories.