An Chonghui
During the reign of the Later Tang emperor Li Siyuan, Li Siyuan's adoptive son Li Congke served as the military governor ("Jiedushi") of Huguo Circuit (護國, headquartered in modern Yuncheng, Shanxi). Ma Yinsun became Li Congke's assistant in Li Congke's role as governor (觀察使, "Guanchashi"). When Li Congke lost his governorship of Huguo due to the machinations of Li Siyuan's chief of staff An Chonghui in 930 and was forced to take up residence at the capital Luoyang with no real authorities, instead of leaving Li Congke, Ma followed Li Congke to Luoyang and continued to serve him. Later (after An's fall from grace and Li Congke's restoration to grace), Ma continued to follow Li Congke to his posts as the mayor of Jingzhao Municipality (京兆, in modern Xi'an, Shaanxi) and then as the military governor of Fengxiang Circuit (鳳翔, headquartered in modern Baoji, Shaanxi).