The Duke of Guangchuan Commandery of the Jin Dynasty was first enfeoffed in the sixth year (350 CE) of the Eastern Jin Dynasty Emperor Sima Yonghe, and the recipient was Gong Hong. Guangchuan was located in the territory of the Western Jin Dynasty and JiZhou, which had already fallen at this time, so this title was more symbolic of the bohai state as the first feudal state of Sima Fu's third son Sima Fu, who was renamed the queen of Taiyuan and became Bohai County. It administers ten counties, namely Nanpi, Dongguang, Fuyang, Rao'an, Gaocheng, Chonghe, Dong'anling, Xiu, Guangchuan, Fucheng, and Nanpi.
苻洪, whose original surname is Pu (蒲), is a native of Linwei County, Luoyang County. As early as the Yongjia Rebellion, Gong Hong had already emerged. Because he was a good giver, and he was brave and resourceful, he was admired by the People of The Qi, so he became a powerful faction. Liu Yao was proclaimed emperor in Chang'an, and Gong Hong chose to submit to Former Zhao and was given the title of Marquis of Yiyi.
After the fall of Former Zhao, Gong Hongnai asked him to surrender to Shi Hu. He was recommended by Shi Hu to serve as the military inspector of Liuyi and the champion general, and was responsible for managing the affairs of Western Later Zhao. After Shi Le's death, Gong Hong again called himself the Yongzhou Assassin and chose to attach himself to Qianliang, but when Shi Hu sent Ma Qiu to fight, Zhi Hong decisively led 20,000 households to surrender to Shi Hu again, and was appointed as the general of Guanglie and the lieutenant of the Guards. Subsequently, Shi Hu persuaded Shi Hu to migrate to Guanzhong's Haoqiang and the Qiang and Qiang tribes to move east to enrich the capital. Shi Hu followed his advice and appointed Gong Hong as the general of Long Jun and the governor of the exiles, and stationed him in Fangtou.
During Shi Hu's reign, Gong Hong was deeply valued, and was successively appointed as an envoy, the governor of liuyi, the champion general, and the duke of Xiping County. More than 2,000 of Gong Hong's men were also knighted, and even if Ran Min persuaded Shi Hu to kill Zhi Hong, shi Hu refused. During the Liang Calf Rebellion, Gong Hong was also ordered to go to quell the rebellion. Afterwards, he was appointed as the Grand General of the Che Cavalry, Kaifu Yi Tongsan Division, Du Du Yong and Qin Prefecture Military Forces, Yong Prefecture Assassin History, Jin Feng as the Duke of Luoyang County.
After Shi Hu's death, Later Zhao fell into civil unrest, and Shi Zun was persuaded by Ran Min to remove Him from his post as governor of the capital, and the other official positions were treated as before. Furious, Shi Jian tried to reconcile with Xiang Hong, but Washong refused. In the sixth year of Yonghe (350 AD), in the leap month of the first month, the Eastern Jin Dynasty court awarded Gong Hong the title of King of Qi, Envoy Jiejie, General of The Northern Expedition, Governor of Hebei, Assassin of Jizhou, and Duke of Guangchuan Commandery.
Although he surrendered to the Eastern Jin Dynasty, this was only a superficial cooperation, and Gong Hong defeated Yao Yizhong in order to capture Guanzhong. In the same year, Gong Hong changed his surname to "苻" according to the proverb "CaoFu should be called Wang", and called himself the Governor of Dadu, the Great General, Da Dan Yu, and the King of Sanqin, and the Duke of Guangchuan County became history.