Perhaps because of the briefness of his reign and his eventual fate, little is known about Wang Yanhan's person prior to his reign, including who his mother was or when he was born. It is known that he was the oldest son of Wang Shenzhi the Prince of Min, and that, at least by 925, he was carrying the title of deputy military governor of Weiwu Circuit — as his father Wang Shenzhi, at that time, had, among his titles, the title of military governor of Weiwu, as a vassal of Later Tang. It was said that Wang Yanhan was handsome, tall, and studious. When Wang Shenzhi fell ill in summer 925, he had Wang Yanhan take over the affairs of the state. When Wang Shenzhi died later in 925, Wang Yanhan took over the state, but initially did not declare any regal titles, but instead only the title of acting military governor of Weiwu.
As military governor of Weiwu
An immediate crisis that Wang Yanhan had to deal with in the aftermaths of Wang Shenzhi's death was that at the same time, one Chen Ben, from Ting Prefecture rose against his rule, gathered 30,000 men, and sieged Ting Prefecture. Wang sent his general Liu Yong with 20,000 men to attack Chen. By spring 926, Liu had defeated and killed Chen, ending his rebellion. Meanwhile, then-reigning emperor of Later Tang, Emperor Zhuangzong, had heard of Wang Yanhan's succession, and bestowed on Wang Yanhan the title of military governor of Weiwu, but shortly after, Emperor Zhuangzong himself was killed in a mutiny. Emperor Zhuangzong was succeeded by his adoptive brother Emperor Mingzong, who confirmed the commission and further gave Wang the honorary chancellor title of Tong Zhongshu Menxia Pingzhangshi.
As king
However, despite these honors granted him by the Later Tang imperial court, Wang Yanhan, who was described to be arrogant and violent by this point, declared himself King of Min in winter 926. He also established a government in the form of an imperial government, referred to his residence as a palace, and declared a general pardon, thus in effect declared independence from Later Tang, although there was no record of him declaring an era name independent of Later Tang's. Wang was said to be distant from his brothers, and shortly after he took over control of the state, sent his younger brother Wang Yanjun out of the capital Fu Prefecture to be the prefect of Quan Prefecture. Further, he was gathering many women among his people to fill his palace. Both Wang Yanjun and an adoptive brother, Wang Yanbing, who was then the prefect of Jian Prefecture, both advised him against it, but he refused to listen, causing friction between him and both of those brothers. Around the new year 927, Wang Yanbing and Wang Yanjun jointly attacked Fu Prefecture. Wang Yanbing arrived first and defeated Wang Yanhan's general Chen Tao, causing Chen to commit suicide. That night, Wang Yanbing took his soldiers, scaled the walls of the city, and entered, capturing Wang Yanhan. Wang Yanbing publicly accused Wang Yanhan of crimes, including murdering their father Wang Shenzhi along with Lady Cui, and executed him. When Wang Yanjun arrived shortly later, Wang Yanbing supported him to be the new acting military governor of Weiwu.
