李罕之
Fu Cun was said to be magnanimous and just in his youth, and was capable of military strategies. Late in the "Qianfu" era (874-879) of Emperor Yizong's son and successor Emperor Xizong, the Tang realm was overrun by agrarian rebels, and Fu led a group of locals in defending the prefecture. Later, when Li Hanzhi, who was also from Chen Prefecture and who had been an agrarian rebel, became a Tang general and was made the prefect of Guang Prefecture (光州, in modern Xinyang, Henan), Fu went to join Li Hanzhi's army. Later, when Li Hanzhi was pressured by the renegade general Qin Zongquan, who had declared himself emperor of a new state centered around nearby Cai Prefecture (蔡州, in modern Zhumadian), Li Hanzhi abandoned Guang Prefecture and joined the army of Zhuge Shuang the military governor ("Jiedushi") of Heyang Circuit (河陽, headquartered in modern Jiaozuo, Henan), and Fu followed him to serve as a minor officer at Heyang; Fu subsequently distinguished himself in battles against Qin's army. After Zhuge's death, Li Hanzhi was forced by Zhuge's other subordinates to become the defender of Huai Prefecture (懷州, in modern Luoyang, Henan) and Li Hanzhi's soldiers were distributed. Fu thereafter went to the domain of Li Keyong the military governor of Hedong Circuit (河東, headquartered in modern Taiyuan, Shanxi) instead. Li Keyong adopted him as a son and changed his name to Li Cunshen; he became a commander of the wing of Li Keyong's army that Li Keyong put his adoptive sons in charge of.