| Princess Myeongan 명안공주 | |
| Princess of Joseon | |
| Father: | Hyeonjong of Joseon |
| Mother: | Queen Myeongseong of the Cheongpung Kim clan |
| Issue: | Oh Won, Duke Munmok (Adopted son) |
| Birth Name: | Yi On-hui |
| Birth Date: | 30 June 1665 |
| Birth Place: | Joseon |
| Death Date: | 25 June 1687 (aged 21) |
| Death Place: | Joseon |
| Place Of Burial: | Sasa-dong, Ansan, Gyeonggi Province, South Korea |
| House: | House of Yi (by birth) Haeju Oh clan (by marriage) |
Princess Myeongan (; 30 June 1665 – 25 June 1687), personal name Yi On-hui, was a Korean princess as the third daughter of Hyeonjong of Joseon and Queen Myeongseong.[1] [2]
On December 21, 1671 (12th year of her father's reign), Yi On-hui was honoured as Princess Myeongan .
After the deaths of their two sisters in 1673, Princess Myeongan was the only surviving sister of the Crown Prince. It was said that their relationship was close as siblings.
In 1679 (5th year of Sukjong's reign), the 14-year-old Princess married the 11-year-old Oh Tae-ju, a son of Oh Du-in, who was a key figure of the Seoin faction. Her husband was honoured as Prince Consort Haechang and their formal wedding ceremony was held on December 18, 1680.[3] [4]
The drought being severe at that time, Song Si-yeol and others filed an appeal requesting that the Princess's residence be built in a modest way to reduce the size and cost.
One year later, after the Princess's in-laws illegally occupied the mounds and fields in Deoksan, Chungcheong Province. A lawsuit broke out and the King ordered them to return the land.
Princess Myeongan died on June 25, 1687, five days from her birthday at the age of 21 years old, and is buried in Sasa-dong, Ansan, Gyeonggi Province, South Korea.[5] A couple years after her death, her husband adopted a male relative his clan, the Haeju Oh clan, to continue their family line. It was reportedly said the King was saddened upon hearing her death.