| Sansang 산상 | |
| Taewang | |
| Succession: | King of Goguryeo |
| Reign: | May 197 – May 227 A.D. |
| Predecessor: | Gogukcheon |
| Successor: | Dongcheon |
| Birth Name: | GO Yeonu/Iimo |
| Birth Date: | ? |
| Birth Place: | Gungnae Seong |
| Death Date: | May 227 A.D. |
| Death Place: | Gungnae Seong |
| Burial Place: | Sansang Neung |
| Issue: | Uwigo |
| Posthumous Name: | Sansang Taewang |
| Father: | Sindae |
| Occupation: | King |
| Queen: | Lady Wu |
| Royal House: | Go |
| Dynasty: | Goguryeo |
| Hanja: | 山上王 |
| Hangul: | 산상왕 |
| Rr: | Sansangwang |
| Mr: | Sansangwang |
| Hanjaborn: | 高延優; 伊夷謨 |
| Hangulborn: | 고연우; 이이모 |
| Rrborn: | Go Yeonu; Iimo |
| Mrborn: | Ko Yŏnu; Iimo |
King Sansang (died 227, r. 196–227[1]) was the 10th ruler of Goguryeo, the northernmost of the Three Kingdoms of Korea. He was the third son of the eighth king Sindae and the younger brother of the ninth king Gogukcheon, who died without an heir.[2]
Upon Gogukcheon's death, his queen Lady U supported Sansang's claim and had him placed on the throne. She then became Sansang's queen.[4] This indicates that the custom of Levirate marriage was still practiced in Goguryeo,[5] but also demonstrated Lady U's power in court.[6]
Balgi, older brother to Sansang, led a rebel force attacking the capital, gaining military support of Chinese faction. Sansang had his younger brother Gyesu repel the attack, and Balgi committed suicide.[7]
Goguryeo was invaded by warlord Gongsun Kang in 204 after the older brother of the Goguryeo King Sansang of Goguryeo, Balgi, went to Gongsun Kang and requested 30,000 soldiers to invade Goguryeo so that Balgi could become king.[8] Around this time, Kang established the Daifang Commandery by separating the southern half from the Lelang commandery. Although Goguryeo defeated the first invasion and killed Balgi,[8] in 209, Kang invaded Goguryeo again seized some of its territory and weakened Goguryeo.
Pressure from Liaodong forced Goguryeo to move their capital in the Hun River valley to the Yalu River valley near Hwando.[9] In 217, he granted refuge to a thousand families from the Liaodong region.[10]
In the eleventh lunar month of 208, the king chased a sacrificial boar to the village of Jutongchon, where he met a young woman and spent the day with her. The queen heard of this and sent royal forces, failing to kill her owing to her assertion that she conceived. The woman gave birth to a son and became a royal concubine.[11] The son was made crown prince in 213 and later became King Dongcheon.[12]
Sansang died during 227, the 31st year of his reign, and was buried in Sansang-neung.