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Fa Xiong's ancestral home was in Mei County (), Fufeng Commandery (), which is in present-day Mei County, Baoji, Shaanxi. His ancestor was Tian Fazhang, who was formally known as King Xiang of the Qi state in the Warring States period. Tian Fazhang's descendants changed their family name from "Tian" to "Fa" after the fall of Qi in 221 BCE. During the reign of Emperor Xuan in the Western Han dynasty, Tian Fazhang's descendants were relocated to the capital province and granted a hereditary official position with an income of 2,000 "dan" () of grain.