The most aggrieved emperor in Chinese history was Zhu Yunwen, Emperor Jianwen, who was usurped by Zhu Di, King of Yan, during the Battle of Jingnan in the Ming Dynasty. Emperor Jianwen was the second emperor of the Ming Dynasty. During his reign, he implemented a series of reforms that were beneficial to the country and the people in an attempt to save the Ming Dynasty from danger. However, due to the problem of his successor and the corruption of some officials, the Ming Dynasty finally fell into the Battle of Jingnan. Emperor Jianwen was usurped by Zhu Di, King of Yan. In the Battle of Jingnan, Emperor Jianwen's army fought with the army of King Yan Zhu Di for a long time. In the end, Emperor Jianwen's army was defeated and Emperor Jianwen himself was forced to abdicate to King Yan Zhu Di. Although Emperor Jianwen was not killed, he was forced into exile and eventually disappeared in Beijing. According to legend, Emperor Jianwen was placed under house arrest by Zhu Di and was forced to accept some strange gifts. In the end, he was forced to commit suicide. He died in a very aggrieved way. It was said that he was tortured to death. Although Emperor Jianwen didn't live to see the end of the Ming Dynasty, his death was indeed very depressing. It fully demonstrated the various difficulties and helplessness that a smart and promising emperor faced after being usurped.