Ma Xisheng (; 899 – August 15, 932), courtesy name Ruona (若訥), formally the Prince of Hengyang (衡陽王), was the second ruler of the Chinese Five Dynasties and Ten Kingdoms Period state Chu, ruling briefly from his father's death in 930 to his own death in 932.
Background
Ma Xisheng was born in 899, during the reign of Emperor Zhaozong of Tang, as the second son of the warlord Ma Yin. At that time, Ma Yin had just taken control of Tan Prefecture (in modern Changsha, Hunan) following the assassination of Ma Yin's predecessor Liu Jianfeng, and was not yet fully in control of Wu'an Circuit (武安, headquartered at Tan Prefecture), which would eventually become the central circuit for the Chu state, but was in the process of gradually consolidating his control. Ma Xisheng's mother Lady Yin, while Ma Yin's favorite, was not Ma Yin's wife — as Ma Yin's first son, Ma Xizhen (馬希振), was said to be born of his wife, who was not named in historical sources. (Ma Yin would eventually have at least 35 sons, and Consort Yuan bore at least one of those of Ma Xisheng's younger brothers, Ma Xiwang (馬希旺), although none of the eventual rulers of Chu subsequent to Ma Xisheng — Ma Xifan, Ma Xiguang, Ma Xi'e, and Ma Xichong — was likely born of her, with Ma Xifan and Ma Xiguang clearly born of a different concubine, Lady Chen.) Ma Xisheng and Ma Xifan were born on the same day, but Ma Xisheng was born earlier on that day. (Another brother, unnamed in historical sources, was likely born on the same day of a different mother, between Ma Xisheng's and Ma Xifan's births, as Ma Xifan was said to be Ma Yin's fourth son.)
During Ma Yin's reign
Ma Yin, who gradually increased the size of his realm over the years, would eventually receive the title of Prince of Chu (楚王, Chu Wang) as the vassal of Tang's successor state Later Liang; he continued to carry that title as a vassal of Later Liang's successor state Later Tang, and later would be further created the King of Chu (楚國王, Chu Guowang) by Later Tang's second emperor Li Siyuan in 927. Apparently after being created king and therefore authorized to create a governmental structure of his own mirroring that of the imperial government, he, in 929, Ma Yin made Ma Xisheng, who then carried the titles of deputy military governor of Wu'an and acting mayor of Changsha, a chancellor with the designation Zhi Zhengshi (知政事), and also put him in charge of the military affairs of the state (總錄中外諸軍事, Zonglu Zhongwai Zhujunshi). It was said that from this point on, all affairs of the state have to first be reported to Ma Xisheng before Ma Yin, making it clear that Ma Xisheng was to be considered his successor. (Ma Xizhen, both because he was born of a wife and because he was older, would be considered the heir under the traditional rules of succession, but Ma Xisheng was said to be selected because Lady Yuan—who was then carrying the regal title of Defei (德妃) and who was the only one that traditional histories attributed a consort title to among Ma Yin's concubines—was Ma Yin's favorite. Ma Xizhen, apparently to avoid a confrontation with Ma Xisheng, became a Taoist monk and excused himself from the court scene.)
Shortly after taking effective control of the Chu administration, Ma Xisheng came to suspect Ma Yin's long-time strategist Gao Yu. Earlier, Gao Jixing, the ruler of Chu's northern neighbor Jingnan, sent a letter to Ma Xisheng, ostensibly to seek permission to allow him to enter into a blood brotherhood with Gao Yu. Ma Xisheng's suspicions were aroused, particularly since his wife Lady Yang's relative Yang Zhaosui (楊昭遂) had ambitions of replacing Gao Yu, and therefore often spoke negatively of Gao to him. Ma Xisheng thus accused Gao of wasteful living and contacting other states, requesting Ma Yin to kill him. Ma Yin refused, but after Ma Xisheng repeatedly requested to at least strip Gao Yu of military command, did so. Gao, displeased, stated to his associates, "I am going to build a mansion in the hills to the west, for retirement. The pony [(a double entendre, as Ma means "horse" in Chinese)] has grown up and can bite now." Ma Xisheng heard the remark and became angry—so angry that he falsely announced that Gao had committed treason, and he slaughtered Gao and his family, without first informing Ma Yin. When Ma Yin heard this, he cried bitterly, but did not punish Ma Xisheng.