King of Wu
When Cao Pi, emperor of the state of Cao Wei, appointed Sun Quan the King of Wu in 221, he enfeoffed Sun Deng as the Marquis of Wanhu (). However, Sun Quan refused the title for his son as he was only 12 years old. One year later Sun Quan designated Sun Deng as the Crown Prince. When Cao Pi demanded that Sun Quan send Sun Deng to the Wei capital Luoyang as a hostage, to guarantee his loyalty, Sun Quan refused and declared independence.