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After Li Xiong's victory, he offered Fan the throne. Fan declined, claiming that the year 304 would be an auspicious date ("jiazi") for someone from the Li family to take the throne. Fan Changsheng then served as the Chancellor of Cheng Han under Li Xiong. Fan later helped to persuade Li Xiong to take the title of emperor. After Fan's death, his son Fan Ben succeeded him as the Chancellor of Cheng Han.