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.

Zhu Biao was the Hongwu Emperor's eldest son and crown prince of the Ming dynasty. His early death created a crisis in the dynasty's first succession that was resolved by the successful usurpation of his brother Zhu Di as the Yongle Emperor, an act with far-reaching consequences for the future of China.