eunuch who completely dominated the Chinese government between 1624 and 1627, ruthlessly exploiting the population and terrorizing the official class. He is usually considered by historians to have been the most powerful eunuch in Chinese history.

Wei's career began as a butler in the service of the mother of Zhu Youjiao, the future Tianqi emperor, who reigned from 1620 to 1627 during the Ming dynasty (1368–1644). Wei became a close companion of Zhu's nurse and with her aid completely captured the young prince's trust. Upon ascending the throne at the age of 15, the Tianqi emperor preferred to devote his time to carpentry rather than to statecraft. In any case, he was too weak and indecisive to provide leadership. Wei, therefore, was able to take advantage of the monarch and become the actual ruler.

In 1624 Wei induced the emperor to give him what amounted to a power of attorney. He hired a division of eunuch troops to control the palace and created a network of spies throughout the empire. Extortionate taxes were levied in the provinces, and the government became filled with unprincipled opportunists. When members of the Donglin party, a group of idealistic Confucian officials dedicated to government reform, attempted to oppose Wei, he responded with a wide-ranging attack on Donglin supporters. Hundreds of loyal officials were put to death or driven out of office.

The remaining officials became sycophants vying for Wei's favour. Temples were erected in his honour, auspicious omens were ascribed to his influence, and in one memorial he was even likened to Confucius. When the emperor died in 1627, however, Wei fell from power. Banished by the new emperor, the eunuch hanged himself to avoid trial.