Prince Heng of the First Rank, or simply Prince Heng, was the title of a princely peerage used in China during the Manchu-led Qing dynasty (1644–1912). As the Prince Heng peerage was not awarded "iron-cap" status, this meant that each successive bearer of the title would normally start off with a title downgraded by one rank vis-à-vis that held by his predecessor. However, the title would generally not be downgraded to any lower than a feng'en fuguo gong except under special circumstances.
The first bearer of the title was Yunqi (允祺; 1680–1732), the Kangxi Emperor's fifth son. He was granted the title "Prince Heng of the First Rank" by his father in 1709. The title was passed down over nine generations and held by 12 persons.
Yunqi (允祺; 1680–1732), the Kangxi Emperor's fifth son, initially a beile from 1698 to 1709, promoted to Prince Heng of the First Rank in 1709, posthumously honoured as Prince Hengwen of the First Rank (恆溫親王)
Hongzhi (弘晊; 1700–1775), Yunqi's second son, initially a feng'en fuguo gong, promoted to feng'en zhenguo gong in 1727 and then to Prince Heng of the First Rank in 1732, posthumously honoured as Prince Hengke of the First Rank (恆恪親王)
Yonghao (永皓; 1755–1788), Hongzhi's tenth son, held the title Prince Heng of the Second Rank from 1775 to 1788, posthumously honoured as Prince Hengjing of the Second Rank (恆敬郡王)
Hongsheng (弘昇; 1696–1754), Yunqi's eldest son, held the title Prince Heng of the First Rank from 1720 to 1727, stripped of his title in 1727, posthumously honoured as a beile under the title Gongke Beile (恭恪貝勒) in 1754
Yongze (永澤; 1741–1810), Hongsheng's third son, held the title of a buru bafen fuguo gong from 1775 to 1790, promoted to beizi in 1790
Yikui (奕奎; 1803–1841), Miansong's second son and Mianjiang's adoptive son, held the title of a feng'en zhenguo gong from 1811 to 1835, stripped of his title in 1835