State Princess Yong'an

Gulun Yong'an Chang Princess (1634–1692), named Feiyanggu, was the eighth daughter of Emperor Taizong of the Qing Dynasty, born to Empress Xiaoduanwen Burji Jite. She held the posthumous title of Duanzhen Chang Princess. Born on the sixteenth day of the leap eighth month in the eighth year of the Tiancong era (1641), during the hour of You, she was initially titled Gulun Princess.

In the sixth year of Chongde (1641), she was engaged to the eldest son of the Zasak Tüshätü Prince of the Mongolian Khorchin tribe, Bayan Huralang, and officially married in the second year of Shunzhi (1645). On the fifteenth day of the second month in the fourteenth year of Shunzhi (1657), Emperor Shunzhi bestowed the Golden Tablet upon Gulun Princess and her sisters, enshrining her as Gulun Chang Princess.

On December 24th of the sixteenth year of Shunzhi (1659), Emperor Shunzhi decreed that Bayan Huralang, whom she was married to, was granted the title of Chang Le Chang Princess (Baisi Hulang Efu Gulun Princess, meaning "White Hulang Efu Gulong Princess") and later re-titled Yong'an Gulun Chang Princess.

On December 21st of the second year of Kangxi (1663), records in the "Feiyanggu and others presenting tribute to the outer vassals, such as our long-fish, pigs, and deer tails, for the imperial review" mention the tribute from Bayan Huralang, Efu of Khorchin, who sent gifts such as long-fish to the Empress Dowager.

On February 14th in the fourteenth year of Kangxi (1675), during the hour of Wei, the Holy Ancestor personally came to the Qianmen Gate, granting food provisions to the Yong'an Gulun Gulong Princess, who was paying respects, as well as to the tribute-bearing Targut tribemates, including the fourth-rank Taiji Taben from the Khorchin tribe.

In January 1692, the Gulun Yong'an Chang Princess passed away at the age of fifty-nine, with the posthumous name Duanzhen.

The First Historical Archives of China hold documents from the 58th year of Qianlong (1793) regarding the marriage of the Khorchin Chongkang Gulun Princess’s Efu, the late Tüshätü Prince Bayan Huralang, as well as the reasons for her marriage to the Khorchin, and official titles conferred upon princesses from Khorchin, including related documents and records.