Liu Yin
At one point, Yang Dongqian was retained to serve on the staff of the warlord Liu Yin, who then controlled the region as the military governor ("Jiedushi") of Qinghai Circuit (清海, headquartered at Guang Prefecture). Liu Yin honored Yang Dongqian as a teacher for himself, and also had Yang serve as his secretary in his role as military governor of Qinghai and Jianwu (建武, converted from Yong District) Circuits. He was said to be Liu Yin's chief strategist in planning the seizure of Ningyuan Circuit (寧遠, headquartered in modern Yulin, Guangxi), which eventually happened in 911 (after Liu Yin's death), from Liu Yin's northern neighbor, Ma Yin the Prince of Chu. (Tang's having fallen by that point, both Liu Yin and Ma were nominal vassals of Later Liang.)