Erzhu Rong
Erzhu Tianguang's father was a cousin of Erzhu Rong, who was a Northern Wei general and the chief of the ethnic Xiongnu Qihu (契胡) tribe. In Erzhu Tianguang's youth, he was described to be resolute and capable in archery and horseriding. Erzhu Rong considered him a close confidant, and often discussed military matters with him. In 528, after Emperor Xiaoming was poisoned by his mother Empress Dowager Hu, it was after consulting with Erzhu Tianguang that Erzhu Rong set out to attack the capital Luoyang to overthrow Empress Dowager Hu. As he did, he entrusted one of his home provinces, Si Province (肆州, roughly modern Xinzhou, Shanxi) to Erzhu Tianguang, and after Erzhu Rong killed Empress Dowager Hu and made Emperor Xiaozhuang emperor, Erzhu Tianguang was created the Duke of Chang'an. In 528, when Erzhu Rong set out to destroy the rebel Emperor of Qi, Ge Rong (葛榮), he entrusted his entire home base, including Bing Province (并州, roughly modern Taiyuan, Shanxi) to Erzhu Tianguang as well, remarking, "Only you can make me feel secure about places where I am not at."