Prince Yu (豫)

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 Dodo (1614–1649), the 15th son of Nurhaci, the founder of the Qing dynasty.

He was awarded the title in 1636 by his half-brother, Huangtaiji, who succeeded their father as the ruler of the Qing Empire.

In 1652, the Shunzhi Emperor downgraded the peerage to Prince Xin of the Second Rank.

In 1778, the Qianlong Emperor restored the peerage as "Prince Yu of the First Rank".