Prince Su of the First Rank (Manchu: ᡥᠣᡧᠣᡳ ᡶᠠᡶᡠᠩᡤᠠ ᠴᡳᠨ ᠸᠠᠩ; hošoi fafungga cin wang; Chinese: 和碩肅親王; pinyin: héshuò sù qīnwáng), or simply Prince Su (Chinese: 肅親王), was the title of a princely peerage of the Manchu-led Qing dynasty of China (1644–1912). It was also one of the 12 "iron-cap" princely peerages in the Qing dynasty, which meant that the title could be passed down without being downgraded.
The first bearer of the title was Hooge (1609–1648), the eldest son of Hong Taiji, the founding emperor of the Qing dynasty. He was awarded the title in 1636 by his father. The peerage was renamed to Prince Xian of the First Rank (Prince Xian) when it was passed on to Hooge's son, Fushou (died 1669), in 1651. It was also given "iron-cap" status later on. In 1778, when Yunzhu (died 1778) was holding the title, the Qianlong Emperor renamed it back to "Prince Su of the First Rank". The peerage was passed down over ten generations and held by 11 persons – eight as Prince Su, and three as Prince Xian.
Hooge (1609–1648; 1st), Hong Taiji's eldest son, held the title Prince Su of the First Rank from 1636 to 1648, posthumously honoured as Prince Suwu of the First Rank (肅武親王)
4Fushou (富綬; 1643–1670; 2nd), held the title Prince Xian of the First Rank from 1651 to 1669, posthumously honoured as Prince Xianque of the First Rank (顯愨親王)
4Danzhen (丹臻; died 1702; 3rd), held the title Prince Xian of the First Rank from 1670 to 1702, posthumously honoured as Prince Xianmi of the First Rank (顯密親王)
2 Chengxin (成信; died 1758), posthumously honoured as Prince Su of the First Rank. He used to be a supporter general.
5Yongxi (永錫; died 1821; 6th), held the title Prince Su of the First Rank from 1778 to 1821, posthumously honoured as Prince Sugong of the First Rank (肅恭親王)
1Jingmin (敬敏; died 1852; 7th), held the title Prince Su of the First Rank from 1821 to 1852, posthumously honoured as Prince Sushen of the First Rank (肅慎親王)
3Huafeng (華豐; died 1869; 8th), held the title Prince Su of the First Rank from 1853 to 1869, posthumously honoured as Prince Suke of the First Rank (肅恪親王)
3Longqin (隆懃; 1840–1898; 9th), held the title Prince Su of the First Rank from 1870 to 1898, posthumously honoured as Prince Suliang of the First Rank (肅良親王)
1Shanqi (善耆; 1866–1922; 10th), held the title Prince Su of the First Rank from 1898 to 1922, posthumously honoured as Prince Suzhong of the First Rank (肅忠親王)
1Xianzhang (憲章; 1885–1947; 11th), held the title Prince Su of the First Rank from 1922 to 1945
6Yanhuang (衍潢; died 1771; 4th), held the title Prince Xian of the First Rank from 1702 to 1771, posthumously honoured as Prince Xianjin of the First Rank (顯謹親王)
5 Baichali (拜察禮; died 1708), posthumously honoured as Prince Xian of the First Rank. He used to be a bulwark general.
3Yunzhu (蘊著; died 1778; 5th), initially succeeded his father as a 3rd class supporter general. He held the title Prince Xian of the First Rank from 1772 to 1778, had his title renamed to Prince Su of the First Rank in 1778, posthumously honoured as Prince Suqin of the First Rank (肅勤親王)
