Dae Muye

Biography

Succession and the Inan Era Name

Dae Muye was the eldest son of Dae Joyeong. After the founder died in 719, Dae Muye succeeded to the Balhae throne. Emperor Xuanzong of Tang sent an envoy to invest him as General of the Left Brave Guard, Prince of Balhae, and Governor of Huhan Prefecture. The investiture continued the existing diplomatic order between Tang and Balhae and gave the new ruler formal recognition from the Tang court. Dae Muye accepted the titles while ruling his own state as Balhae’s monarch. In the same year he adopted the era name Inan, establishing an independent system of dating for Balhae’s domestic affairs. In diplomatic dealings with Tang, Balhae also used Tang era dates, balancing its own kingship with the conventions of external relations.

After his accession, Dae Muye worked to strengthen royal authority and central control over military and political affairs. He developed Balhae’s military organization on the foundation created during the kingdom’s establishment. Military forces served in defense, campaigns, and efforts to extend Balhae’s influence over surrounding peoples. Under Dae Muye, state-building and territorial expansion proceeded together. Balhae’s governing reach expanded, and its strength became an important factor for Tang and other Northeast Asian states.

The Heishui Mohe Question and Dae Munye’s Flight

In 726, the Heishui Mohe sent envoys to Tang. The Tang court established Heishui Prefecture in their territory and appointed officials there. Dae Muye viewed this development as a security concern: travel from the Heishui Mohe to Tang passed through areas under Balhae’s influence, and a direct relationship between the two could expose Balhae to pressure from more than one direction. To prevent this change, he ordered his younger brother Dae Munye and their maternal uncle Im Ya to lead an expedition against the Heishui Mohe.

Dae Munye had previously lived in Tang and understood the scale of Tang’s power and the risks of war. He opposed attacking the Heishui Mohe, arguing that this could bring Balhae into direct conflict with Tang. Dae Muye nevertheless insisted that the expedition proceed. When the forces reached the frontier, Dae Munye again sent a remonstrance. Dae Muye recalled him and intended to punish him. Dae Munye left the army and made his way to Tang, where he sought protection. Emperor Xuanzong granted him an office and arranged for him to remain in Tang territory. Dae Muye repeatedly sent petitions demanding that Tang execute Dae Munye. The Tang court maneuvered between protecting the fugitive prince and avoiding a direct escalation with Balhae. The brothers’ break transformed a disagreement over frontier policy into the central dispute between Balhae and Tang.

War with Tang and Diplomatic De-escalation

In 732, Dae Muye ordered the general Zhang Wenxiu to lead a naval force against Dengzhou. The attack struck a Tang coastal stronghold and killed the prefect Wei Jun. Dae Muye then personally led a land force into the Madushan area of Hebei. Balhae’s sea and land operations brought the fighting to Tang’s northeastern frontier and the northern Shandong coast. Dengzhou was an important port for coastal transport and external trade, so the attack further strained relations between the two states.

Emperor Xuanzong ordered a military response and, the following year, sought pressure from the south by coordinating with Silla. In 733, severe cold and deep snow impeded the Silla force, preventing the operation from achieving its intended result. Dae Muye also sent assassins against Dae Munye in Tang, but the attempt failed. Tang authorities investigated and punished those involved. The continuing confrontation showed that Balhae could strike Tang’s frontier but also faced the possibility of pressure from Tang, Silla, and the Heishui Mohe acting in concert.

After these clashes, Dae Muye sent an envoy to Tang to apologize, attributing the dispute to conflict within his family. The Tang court accepted the statement, and relations resumed. Dae Muye adjusted his policy toward Tang to prevent the conflict from widening while safeguarding Balhae’s kingship and commercial access. Thereafter, formal diplomatic and tribute relations continued, while Balhae retained room for independent decisions and relations with other neighboring states.

Diplomacy with Japan and the Khitan; Territorial Development

Facing several powerful neighbors in Northeast Asia, Dae Muye pursued diplomacy in multiple directions. He sent an embassy led by Go Inui to Japan to establish closer relations and maintained contacts with the Khitan, seeking to balance pressure from Tang, the Heishui Mohe, and Silla. Envoys traveling between Balhae and Japan carried out political communication and ceremonial exchange, and maritime contact also facilitated the movement of goods. By cultivating different relationships, Dae Muye sought to prevent Balhae’s diplomatic and military choices from being constrained by a single neighbor.

Balhae’s territory expanded during Dae Muye’s reign. Accounts describe its eastern frontier reaching the Suifen River and the coastal area of present-day Russia, while its southern reach extended to the Taedong River. Frontier growth involved campaigns against Mohe groups, management of coastal routes, and deployment of military forces. These military and diplomatic activities reinforced one another, raising Balhae’s position in Northeast Asia and creating a foundation for later rulers to continue institutional development and external trade.

Death and Succession

Dae Muye died in 737 and was later known as King Mu. Balhae sent an envoy to Tang to report his death, and his son Dae Heummu succeeded him. Dae Heummu later adopted the era name Daeheung and became known as King Mun of Balhae. Dae Muye’s reign of nearly two decades encompassed succession, military and political development, expansion, war with Tang, and the restoration of relations. He used military force to defend Balhae’s interests but also turned to diplomacy after the fighting to avoid prolonged war. His rule laid important foundations for the development of Balhae’s early royal authority and regional influence.

Major Activities

Strengthening Central Authority and the Military

After his accession, Dae Muye promoted stronger royal and central control and developed Balhae’s military organization. These measures supported defense and campaigns across an enlarged territory. His adoption of the era name Inan also demonstrated the development of Balhae’s independent royal chronology.

Expanding the Frontier

Under Dae Muye, Balhae expanded its influence among northern groups including the Heishui Mohe and strengthened its southern frontier against Silla. Campaigns and frontier administration enlarged Balhae’s regional presence.

Fighting Tang and Restoring Relations

Disputes over the Heishui Mohe, Dae Munye’s flight, and Tang’s frontier policy led to war. The attack on Dengzhou and the land campaign in Hebei in 732 were the high point of the confrontation. Dae Muye later sent an apology, and diplomatic contact resumed, showing his shift between military resistance and diplomatic adjustment.

Developing Diplomacy with Japan and Other States

Dae Muye sent envoys to Japan and maintained contact with the Khitan. Diplomacy in several directions, combined with military preparedness, helped Balhae preserve strategic space and access to trade routes amid regional competition.

Personal Relations

• Dae Joyeong: Founder and first ruler of Balhae; Dae Muye’s father and predecessor.
• Dae Munye: Dae Muye’s younger brother. Ordered to campaign against the Heishui Mohe, he opposed a war with Tang and fled to Tang territory.
• Dae Heummu: Dae Muye’s son and successor; later known as King Mun of Balhae.
• Im Ya: Dae Muye’s maternal uncle, appointed to lead the campaign alongside Dae Munye.
• Zhang Wenxiu: Balhae general who led the naval attack on Dengzhou in 732.
• Emperor Xuanzong of Tang, Li Longji: Tang ruler who invested Dae Muye and managed the dispute over Dae Munye during the conflict.
• Rulers of Silla: Southern neighbors of Balhae; the two states fought along their frontier during Dae Muye’s reign.
• Khitan leaders: Partners in Dae Muye’s western diplomatic relations.

Historical Assessment

Traditional Records

Tang histories record Dae Muye’s succession, investiture, adoption of the Inan era name, handling of the Heishui Mohe and Dae Munye affair, attack on Dengzhou, and restoration of relations with Tang. These accounts often present Balhae through the lens of Tang frontier administration and diplomacy, while also preserving the sequence of negotiations between Dae Muye and the Tang court.

Later Assessments

Later tradition remembers Dae Muye as King Mu and treats his reign as an important stage in the consolidation of Balhae’s early kingship and territorial expansion. His rule involved both major conflict with Tang and sustained relations with Japan, the Khitan, and other neighbors, illustrating a mode of government in which military action and multidirectional diplomacy operated together.

Modern Scholarship

Modern research examines the development of Balhae’s institutions and military under Dae Muye, its investiture relationship and conflicts with Tang, the strategic context of the Heishui Mohe and Dae Munye affair, and Balhae’s ties with Japan, the Khitan, and Silla. By comparing records from Tang, Silla, Japan, and Northeast Asia, scholars study how Balhae protected its security and diplomatic autonomy amid regional competition.