What is the origin of Zhang?

Lu Haijun, a former marshal of the Republic of China, exercised sovereignty on behalf of the Republic of China and became the supreme ruler of the country. Zhang is a native of Linqu, Shandong. Historically, Zhang's ancestral home has been controversial and various theories coexist. One said that he was a writer from Hebei Province. He was a bandit when he was young. His people refused to recognize their ancestors for fear of humiliating them and causing trouble. Some say that he is a big shot in Hebei and has known his ancestors. In fact, the former does not exist. On the other hand, there are few written records about Shandong people, only that the family population is prosperous. According to my research, the real reason is that after his ancestors entered Kanto from Linqu County, Shandong Province, the economy was poor, the traffic information was inconvenient, and the traffic in his hometown was remote and blocked. Like many Shandong immigrants, he lost contact with his hometown people, with backward communication and inconvenient transportation. Neither side knows the other. When Zhang's ancestors were hungry and cold, how could they have the mood and ability to return to their hometown to recognize their ancestors? Later, even though he was powerful and rich, he lost contact with his hometown like many ordinary Shandong immigrants. Judging from the fact that Zhang's funeral notes were written at the same time as his ancestral home, they are inconsistent. The former said Hebei, the latter said Shandong, which shows that it has been lost for many years and is at a loss. Just writing at the same time, each saying coexists, and future generations can further textual research. After a long-term search and thorough investigation of historical materials, I finally confirmed that the ancestral homes of Zhang Dadu and Zhang Xueliang Xiaodu are Linqu County.