Seon of Balhae

Dae Insu, also known as King Seon (r. 818-830) was the 10th king of the kingdom of Balhae. He restored national strength, and is remembered today as the last of the great Balhae rulers before its fall.

Seon of Balhae
Chinese name
Birth name in Chinese
Korean name
Birth name in Korean
Monarchs of Korea
  1. Go 698–719
  2. Mu 719–737
  3. Mun 737–793
  4. Dae Won-ui 793
  5. Seong 793–794
  6. Gang 794–809
  7. Jeong 809–812
  8. Hui 812–817
  9. Gan 817–818
  10. Seon 818–830
  11. Dae Ijin 830–857
  12. Dae Geonhwang 857–871
  13. Dae Hyeonseok 871–894
  14. Dae Wihae 894–906
  15. Dae Inseon 906–926


Dae Insu was a 4th-generation descendant of Dae Joyeong's younger brother, Dae Ya-bal. In spite being from the collateral branch, he succeeded to the throne during the years of 817 and 818. He reestablished royal authority, and strengthened the military tremendously.


The territory of Balhae in 830, during the reign of king Seon of Balhae.

King Seon concentrated heavily on the empire's territorial expansion, and led campaigns that resulted in the absorption of many northern Malgal tribes including Heishui Mohe. Southwest Little Goguryeo in Liaodong was absorbed into Balhae, and also he ordered southward expansion towards Silla.

During his 12-year reign, he dispatched embassies five times to Japan, which was aimed at establishing diplomatic relations as well as increasing trade between the two kingdoms. Balhae emissaries were treated favorably even though Japan wanted Balhae to restrict the size of the embassies due to the costs associated with hosting them. The trade routes established across the Sea of Japan led to Balhae becoming one of Japan's most important trading partners.

He died in 830 and his grandson Dae Ijin succeeded to the throne.

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Seon of Balhae
 Died: 830
Regnal titles
Preceded by
King of Balhae
Succeeded by
Dae Ijin