This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Grand Prince Wolsan" – news · newspapers · books · scholar · JSTOR (June 2021) (Learn how and when to remove this message)

Grand Prince Wolsan (Korean: 월산대군; Hanja: 月山大君; 18 December 1454 – 21 December 1488) was a Korean Royal Prince as the oldest son of Deokjong of Joseon and Queen Sohye. His personal name was Yi Jeong (이정; 李婷).

He become a Grand Prince in 1470. Even his father was honoured as King Uigyeong (의경왕) in 1470,^[3] Great King Hoegan (회간대왕) in 1475,^[4] and given temple name Deokjong (덕종), the Prince didn't succeed his father as a Crown Prince. Later, he built a villa in his hometown in Bukchon and spent his life reading books and writing poetry there.^[5]

The Prince was born on 18 December 1454 as the oldest son of Crown Prince Uigyeong and Crown Princess Han of the Cheongju Han clan, he was also the oldest grandson of King Sejo. When the Prince was young, he grew up under the love of his grandfather. In 1457, his father died suddenly, then he was raised in the court by his grandfather.

In 1460 (6th year reign of his grandfather), he was appointed as Prince Wolsan (월산군; 月山君). When his uncle, Yejong of Joseon died suddenly at the young age, his little brother was appointed as the new King for succeeded him and then, he was appointed as Grand Prince Wolsan (월산대군; 月山大君).

On 19 August 1466, when the Prince was 9 year old, he then married Lady Bak, the daughter of Bak Jung-seon (박중선) from the Suncheon Bak clan and Lady Heo (부인 허씨) of the Yangcheon Heo clan. Lady Bak was one year older than the Prince.

After his death, Seongjong firstly gave him a posthumous name as Gong-gan (공간; 恭簡) then changed into Hyo-Mun (효문; 孝文). After his death, the Prince was buried in 427, Sinwon-ri, Wondang-myeon, Goyang-gun, Gyeonggi Province (now is Sinwon-dong, Deokyang-gu, Goyang-si, South Korea) alongside his wife, Grand Princess Consort Seungpyeong. His concubine, Lady Gim (부인 김씨) was also buried nearby from his. His tombstone was written by Im Sa-hong (임사홍) in 1498 (4th year reign of Yeonsangun of Joseon).

The Prince often wrote some poems such as:

1. Gukjosisan (국조시산; 國朝詩刪)
2. Dongmunseon (동문선; 東文選)
3. Yeojiseungram (여지승람; 輿地勝覽)
4. Daedongsirim (대동시림; 大東詩林)
5. Pungwoljeongjip (풍월정집; 風月亭集); was published by King Seongjong to the Ming dynasty after his death

And his other poems were also introduced to Ming dynasty and some of them were added to Jeonusanyeoljo Poetry Book (전우산열조시집; 錢虞山列朝詩集) in China.^{[citation needed]}

• The Taesil of Grand Prince Wolsan (월산대군 태실) – 291–1, Umyeon-dong, Seocho-gu, Seoul, South Korea (Seoul Metropolitan Monument No. 30).^[6][7]
• The Military Temple of Grand Prince Wolsan (월산대군사당) – 427, Sinwon-dong, Deokyang-gu, Goyang-si, Gyeonggi Province, South Korea (Gyeonggi-do Cultural Heritage Data No. 79).^[8][9]
• The Tomb and Sindo Monument of Grand Prince Wolsan (월산대군 묘 및 신도비) – San 16–35, Sinwon-dong, Deokyang-gu, Goyang-si, Gyeonggi Province, South Korea (Goyang City Local Historic Site No. 1).^{[citation needed]}

• Father: Deokjong of Joseon (1438 – 2 September 1457)
• Mother: Queen Sohye of the Cheongju Han clan (7 October 1437 – 11 May 1504)

Sibling(s):

1. Younger sister: Yi Gyeong-geun, Princess Myeongsuk (1456 – 4 October 1482)
2. Younger brother: Yi Hyeol, Grand Prince Jalsan (이혈 잘산대군; 19 August 1457 – 20 January 1494)

• Consort(s) and their respective issue(s):

1. Grand Princess Consort Seungpyeong of the Suncheon Park clan (승평부부인 박씨; 1455 – 20 July 1506) – No issue.
2. Grand Princess Consort of the Wonju Kim clan (부부인 원주 김씨)
   1. Son: Yi Yi, Prince Deokpung (이이 덕풍군; 20 August 1485 – 26 March 1506)

• Portrayed by Im-ho in the 1994 KBS2 TV series Han Myunghoi.
• Portrayed by Shin Kwi-hik in the 1995 KBS2 TV Series Jang Noksu.
• Portrayed by Song Ho-seop and Lee-in in the 1998–2000 KBS1 TV Series The King and the Queen.
• Portrayed by Jang Hee-woong, Ahn Hyun-joon, Wi Hun-tae and Lee Ji-oh in the 2011–2012 JTBC TV series Insu, the Queen Mother.

• Dong-ik, Jang (1997). 월산대군. Encyclopedia of Korean Culture (in Korean). Academy of Korean Studies. Retrieved June 27, 2021.
• EncyKor. 월산대군 [Grand Prince Wolsan]. Encyclopedia of Korean Culture.