During Later Tang

Around the new year 929, Gao Jixing fell ill, and put Gao Conghui in charge of Jingnan's headquarters. Gao Jixing died shortly after. Yang Pu thereafter gave him the title of military governor of Jingnan, and bestowed on him the greater honorary chancellor title of Shizhong (侍中).^[1]

Upon his assumption of Jingnan's governance, however, Gao Conghui believed that it was inadvisable to continue to be inimical to Later Tang and be a vassal to Wu, pointing out that Wu's main territory was much farther away than Later Tang. He therefore, through his southern neighbor Ma Yin the King of Chu, offered apologies to Li Siyuan, and later also made the same request by writing Later Tang's military governor of Shannan East Circuit (山南東道, i.e., the same circuit as Zhongyi), An Yuanxin (安元信). When An relayed his request to Li Siyuan, Li Siyuan agreed to his request to resubmit. He then submitted a petition, referring to himself to only to his former Later Tang-approved titles of commander of the Jingnan army and prefect of Gui Prefecture (i.e., not with the ones that Wu had conferred). Li Siyuan accepted his submission, gave him the titles of military governor of Jingnan and Shizhong, and formally terminated the campaign against Jingnan. (Later Tang had not pursued the campaign actively for several years, but had never formally terminated the campaign.)^[1] Gao also submitted a petition to Yang, apologizing for resubmitting to Later Tang, but asking that his decision be excused because he had been concerned that the tombs of the Gao ancestors, located within Later Tang territory, would be destroyed. Wu sent an army to attack Jingnan, but could not capture it.^[13]

In 931, Li Siyuan gave Gao the honorary chancellor title Zhongshu Ling (中書令). In 932, he created Gao the Prince of Bohai.^[13] In 934, he created Gao the Prince of Nanping^[14] — the same title that Gao Jixing had held previously.^[7]

It was said that Gao was intelligent, understanding, humble, and willing to listen to others. He particularly trusted Gao Jixing's chief strategist Liang Zhen, treating Liang as an older brother. There was an occasion when people relaying the news to him about the court of Ma Yin's son and successor Ma Xifan, who then carried the title of Prince of Chu, talking of the grandeurs of Ma Xifan's lifestyle. Initially, Gao, impressed, stated, "Prince Ma is truly a man." His staffer Sun Guangxian responded:^[15]

The Son of Heaven and his vassals have different rites. That young milk-stenched boy is arrogant and wasteful. He may enjoy it for some time, but he does not think about the future. His state will soon fall. There is no need to be jealous of him.

Gao initially did not realize the wisdom of Sun's words, but after some time, he did. He stated to Liang, "After I thought about my daily living, I believe that I am already excessive." He thus ended using luxurious items, and spent his time enjoying reading classical literature. He also was merciful in punishments and did not impose great tax burdens, so his people were comforted. Liang, believing that the state was in good hands, sought to retire, and after Gao could not dissuade him from the idea, allowed him to, but built a grand mansion for him on an island and would occasionally visited him to give him many gifts. Liang, in retirement, also still occasionally visited him and gave him advice. After Liang's retirement, he entrusted the affairs of the state to Sun.^[15]

In 936, believing that Wu's regent Xu Zhigao was interested in seizing the Wu throne, Gao wrote him to encourage him to do so.^[16] Xu eventually did so, in 937, ending Wu and establishing Southern Tang, and thereafter changing his name to Li Bian, as Li was his original family name.^[17] Subsequently, Gao requested to establish a liaison office at Southern Tang's capital Jinling, and Li Bian agreed.^[4]

During Later Jin

In 941 — by which time Later Tang had fallen, and its former territory was ruled by Shi Jingtang (Li Siyuan's son-in-law) as the emperor of the succeeding Later Jin — Later Jin's military governor of Shannan East, An Congjin, was plotting to rebel against Later Jin, and he sent emissaries to ask for aid from both Gao Conghui and Later Shu's emperor Meng Chang. Meng declined the overture, and Gao wrote An, urging him not to rebel. An, in anger, instead reported to Shi that Gao was planning to rebel against Later Jin. At the urging of his commander of the army, Wang Baoyi (王保義), Gao submitted An's letters to Shi, and offered to aid the Later Jin imperial government in coming operations against An. Subsequently, when An did in fact rebel, both Gao and Ma Xifan sent fleets and food supplies to aid the Later Jin commander of the operations against An, Gao Xingzhou.^[18] Gao Xingzhou was subsequently able to defeat An, and An committed suicide.^[19] After An's defeat, Gao requested Shi's nephew and successor Shi Chonggui that Later Jin gave him Ying Prefecture (郢州, in modern Jingmen, Hubei); Shi Chonggui declined.^[4]

During Liao and Later Han

In a campaign in 946-947, Emperor Taizong of the Khitan Liao Dynasty successfully captured Kaifeng and forced Shi Chonggui to surrender, ending Later Jin.^[20][21] Emperor Taizong claimed to also be the emperor of China, and, initially, the Later Jin regional governors submitted to him. Gao Conghui also did so, and offered tributes to him. At the same time, though, Gao also sent emissaries to one of the holdouts, Liu Zhiyuan the military governor of Hedong Circuit (河東, headquartered in modern Taiyuan, Shanxi), urging Liu to claim imperial title.^[21] He promised to support Liu if Liu would later give him Ying Prefecture, and Liu agreed.^[7]

After the Liao subsequently (in stages, both before and after Emperor Taizong's death later in 947) withdrew from Later Jin lands, Liu, who claimed the title of emperor of a new Later Han, entered Kaifeng.^[21][22] He notified Gao of this. Gao sent an emissary to congratulate the new emperor, and at the same time asked him to fulfill his promise of giving Gao Ying Prefecture. Liu refused, and subsequently, when Liu sent an emissary to bestow honors on Gao, Gao refused to accept the honors. When the Later Han general Du Chongwei later rebelled against Liu at Tianxiong Circuit (天雄, headquartered in modern Handan, Hebei), Gao took the opportunity to attack Shannan East Circuit, but was repelled by its military governor An Shenqi (安審琦). He then attacked Ying, but was repelled by its prefect Yin Shi (尹實). He thereafter cut off his relationship with Later Han, and instead submitted as a vassal to both Southern Tang and Later Shu.^[22]

Traditional histories used this incident to comment on the peculiar pattern of conduct that both Gao Conghui and his father Gao Jixing had demonstrated throughout Jingnan's existence. As put by the Song Dynasty historian Ouyang Xiu in his New History of the Five Dynasties:^[10]

Jingnan's territory is small, and its army was weak. It was a small state wedged between Wu and Chu. At the time that Wu claimed imperial title, Southern Han, Min, and Chu all still followed the era names of Later Liang. Their annual tributary emissaries all would journey through Jingnan. Both Gao Jixing and Gao Conghui often detained the emissaries and seized their tributes. If these other circuits wrote rebuking declarations or attacked Jingnan, then they would return the tributes without showing signs of shame. Later, Southern Han, Min, and Shu all claimed imperial titles. Gao Conghui would refer to himself as "subject" to all of them, to take advantage of their bestowments. ... The other states thus all referred to him as "Scoundrel Gao."

However, cutting off relations with Later Han meant that the merchants and the travelers from Later Han stopped visiting Jingnan, which caused economic stress on the small state. In 948, Gao gave in and petitioned Liu's son and successor Liu Chengyou to again submit to Later Han. Liu Chengyou sent an emissary to comfort him.^[2]

In late 948, Gao fell ill, and had his son and deputy military governor Gao Baorong take over the affairs of the state. He died shortly after.^[2]