Yixin, better known in English as Prince Kung or Gong, was an imperial prince of the Aisin Gioro clan and an important statesman of the Manchu-led Qing dynasty in China. He was a regent of the empire from 1861 to 1865 and wielded great influence at other times as well.

Xinyou Coup was a Chinese palace coup instigated by Empress Dowagers Cixi and Ci'an, and Prince Gong to seize power after the death of the Xianfeng Emperor in 1861. On his deathbed, the emperor had appointed a group of eight regents, led by Sushun, who were adjutant generals and grand councillors, to assist his infant son Zaichun, later to be known as the Tongzhi Emperor. The eight regents, Zaiyuan, Duanhua, Jingshou, Sushun, Muyin, Kuangyuan, Du Han and Jiao Youying were later forced to commit suicide. Other sources says only three officials were forced to commit suicide.