The Jianwen Emperor, personal name Zhu Yunwen (朱允炆), also known by his temple name as the Emperor Huizong of Ming (明惠宗) and by his posthumous name as the Emperor Hui of Ming (明惠帝), was the second emperor of the Ming dynasty, reigned from 1398 to 1402. Zhu Yunwen's father was Zhu Biao, the eldest son and crown prince of the Hongwu Emperor, the founder of the Ming dynasty. Zhu Biao died at the age of 37 in 1392, after which the Hongwu Emperor named Zhu Yunwen as his successor. He ascended the throne after the Hongwu Emperor's death in June 1398.

The Jingnan campaign, or Jingnan rebellion, was a three-year civil war from 1399 to 1402 in the early years of the Ming dynasty of China. It occurred between two descendants of the Ming dynasty's founder Zhu Yuanzhang: his grandson Zhu Yunwen by his first son, and Zhu Yuanzhang's fourth son Zhu Di, Prince of Yan. Though Zhu Yunwen had been the chosen crown prince of Zhu Yuanzhang and been made emperor upon the death of his grandfather in 1398, friction began immediately after Yuanzhang's death. Zhu Yunwen began arresting Zhu Yuanzhang's other sons immediately, seeking to decrease their threat. But within a year open military conflict began, and the war continued until the forces of the Prince of Yan captured the imperial capital Nanjing. The fall of Nanjing was followed by the demise of the Jianwen Emperor, Zhu Yunwen. Zhu Di was then crowned the Ming Dynasty's third emperor, the Yongle Emperor.