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Yunsi
For the place and area in Persia/Iran see Yunesi.

Yunsi (29 March 1681 – 5 October 1726), born Yinsi, was a Manchu prince of the Qing dynasty in China. The eighth son of the Kangxi Emperor, Yunsi was a pivotal figure in the power struggle over the succession to his father's throne. Yunsi was believed to be favoured by most officials in the imperial court to be the next emperor but ultimately lost the struggle to his fourth brother Yinzhen, who became the Yongzheng Emperor.

After the Yongzheng Emperor ascended the throne in 1723, Yunsi was named a top advisor to the new emperor and imperial chancellor, the head of the Lifan Yuan, in addition to being awarded the title "Prince Lian of the First Rank". He was removed from office four years later, his titles stripped, then he was banished from the imperial clan. He was charged with a litany of crimes and sent to prison, where he died in disgrace. He was posthumously rehabilitated during the Qianlong Emperor's reign.