Wang Yanhan (Chinese: 王延翰) (died January 14, 927), courtesy name Ziyi (子逸), also known by his posthumous name as the King Si of Min (閩嗣王), was a ruler of Min during the Five Dynasties and Ten Kingdoms period of China. He ruled briefly after the death of his father Wang Shenzhi (Prince Zhongyi) without a regal title, but later declared himself king. Just two months after declaring himself king, he was overthrown and killed in a revolt by his adoptive brother Wang Yanbing and younger biological brother Wang Yanjun. Wang Yanjun took over the state thereafter.
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Background
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 (威武, headquartered in modern Fuzhou, Fujian) — as his father Wang Shenzhi, at that time, had, among his titles, the title of military governor (Jiedushi) 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. (A rumor at that time — later claimed to be true by Wang Yanhan's adoptive brother Wang Yanbing — was that Wang Shenzhi was poisoned by Wang Yanhan's wife Lady Cui, but it cannot be known whether the rumor was true.)