Zhao Guangyin (; died May 23, 925) was an official during China's Five Dynasties and Ten Kingdoms period. He was the chancellor during Later Tang. He was a son of the Tang Dynasty chancellor Zhao Yin and younger brother of the Later Liang chancellor Zhao Guangfeng and Southern Han chancellor Zhao Guangyi. (He is referred to as Zhao Guangyun (趙光允) in some subsequent historical accounts written during the Song Dynasty as part of naming taboo for Song's founding emperor Emperor Taizu of Song (Zhao Kuangyin), but because the naming taboo appeared to be largely limited to consecutive uses of the characters "Kuang" and "Yin," other Song Dynasty sources refer to him as Guangyin.) Background It is not known when or where Zhao Guangyin was born. His father Zhao Yin served as a chancellor during the reigns of Emperor Yizong of Tang and Emperor Yizong's son and successor Emperor Xizong. His two older brothers Zhao Guangfeng and Zhao Guangyi were both known for their literary talents and virtue. Zhao Guangyin himself, like they were, was known for his ability to write poems, and he passed the imperial examinations in the Jinshi class in 891, during the reign of Emperor Xizong's brother and successor Emperor Zhaozong. He subsequently served in the Tang imperial government, reaching the post of Jiabu Langzhong (駕部郎中), a supervisory official at the ministry of rites (禮部, Libu). During Later Liang During the time of Tang's successor state Later Liang, Zhao Guangfeng served as a chancellor for some time. Zhao Guangyin himself was said to have served in some (unspecified) high positions. It was said that he was considered righteous and elegant in his behavior, such that his reputation drew respect even in the territory of Later Liang's archrival to the north, Jin. During Later Tang In 923, Later Liang was conquered by Jin's successor state Later Tang, whose emperor Li Cunxu took over Later Liang territory. Shortly after, his officials opined that he needed additional chancellors who were familiar with the regulations of Tang Dynasty, which Later Tang viewed itself as the legitimate successor to — at that time, the only chancellors were Doulu Ge and Guo Chongtao (and Guo also served as his chief of staff). While the popular opinions at that time were that both Xue Tinggui (薛廷珪) and Li Qi were learned and appropriate candidates, Guo opined that Xue was frivolous and lacking the appropriate