Goryeo Dynasty (918): Wang Geon Founds the Kingdom of Korea

The Goryeo dynasty was founded in 918 when the general Wang Geon overthrew his erratic master, Gung Ye, and took the throne in central Korea. Within eighteen years Goryeo had absorbed the old kingdom of Silla and destroyed its rival Later Baekje, reuniting the Korean peninsula in 936. The dynasty ruled until 1392, and its name, carried abroad by traders, is the origin of the English word “Korea”.

Background: the decline of Silla

After the unification of the peninsula under Silla in the 7th century, Unified Silla enjoyed more than a century of stability. By the late 9th century, however, the kingdom was in deep trouble. Royal family members fought over the throne, the capital at Gyeongju lost control of the provinces, and peasant revolts broke out after the state pressed hard for taxes in 889.

Power passed to local strongmen known as hojok: castle lords, garrison commanders and wealthy maritime families who ran their own districts. Some of these leaders began to build kingdoms of their own.

The Later Three Kingdoms

Two rebel states emerged from Silla’s collapse. In the south-west, the soldier Gyeon Hwon proclaimed Later Baekje around 892–900, claiming the heritage of the old kingdom of Baekje. In the centre and north, Gung Ye, a former Buddhist monk said to be of Silla royal descent, founded Later Goguryeo in 901.

Gung Ye renamed his state Majin in 904 and Taebong in 911, and moved his capital to Cheorwon. Together with the shrunken Silla, these states are known as the Later Three Kingdoms. Gung Ye grew increasingly despotic. He declared himself a living Buddha, Maitreya, claimed to read minds, and, according to the later official histories, executed officials and even his own wife and sons on suspicion. Those accounts were written under Goryeo, so they may exaggerate his faults, but his support clearly collapsed.

Wang Geon’s rise

Wang Geon (877–943) came from a powerful family of Songak, today’s Kaesong, which had grown rich from sea trade along the west coast. His father submitted to Gung Ye in 896, and Wang Geon became one of Gung Ye’s most successful commanders.

His greatest achievement was at sea. Around 903 he led a fleet that seized the Naju area in the far south-west, behind Later Baekje’s lines, and he defended it in later campaigns. These victories made him the leading general of Taebong and gave him a following among both soldiers and regional families.

The founding of Goryeo in 918

In 918 a group of senior generals, traditionally named as Hong Yu, Bae Hyeon-gyeong, Sin Sung-gyeom and Bok Ji-gyeom, turned against Gung Ye and urged Wang Geon to take power. Gung Ye fled and was killed soon afterwards. Wang Geon was enthroned in the sixth month of the lunar calendar, in the summer of 918.

He named his kingdom Goryeo, a shortened form of Goguryeo, the great northern kingdom of the Three Kingdoms period. The name announced a claim to Goguryeo’s lands in the north. In 919 he moved the capital to his home base of Songak, renamed Gaegyeong.

Reunification, 918–936

Wang Geon treated Silla with respect while fighting Later Baekje. The struggle was hard. In 927 Gyeon Hwon raided Gyeongju, forced Silla’s King Gyeongae to take his own life and placed a new king, Gyeongsun, on the throne. When Wang Geon marched to help, he was heavily defeated at the Battle of Gongsan near modern Daegu. His general Sin Sung-gyeom is said to have died in his place after exchanging armour with him.

The tide turned in 930, when Goryeo won a major victory near Gochang, modern Andong, and many local lords switched sides. Later Baekje was then torn apart from within. In 935 Gyeon Hwon’s eldest son, Singeom, deposed and imprisoned his father, who escaped and fled to Goryeo.

The same year Silla’s King Gyeongsun peacefully surrendered his kingdom, ending a dynasty that had lasted almost a thousand years by tradition. Wang Geon gave him high rank and married into his family. In 936 Goryeo’s army, with Gyeon Hwon in its ranks, defeated Singeom at the Battle of Illicheon near modern Gumi, and Later Baekje was destroyed.

Key people

• Wang Geon, King Taejo (877–943): merchant-family general who founded Goryeo and reunified the peninsula.
• Gung Ye (died 918): founder of Later Goguryeo/Taebong, overthrown by his own generals.
• Gyeon Hwon (867–936): founder of Later Baekje who ended his life as Wang Geon’s ally against his own son.
• King Gyeongsun (r. 927–935): the last ruler of Silla, who handed his kingdom to Goryeo.
• Sin Sung-gyeom (died 927): general remembered for sacrificing himself at Gongsan.

How Wang Geon held the kingdom together

Goryeo was at first a federation of powerful regional families rather than a centralised state. Wang Geon bound them to the throne through marriage, taking 29 wives from leading families, and by granting royal surnames, land and titles to local leaders.

He welcomed refugees from Balhae, the northern kingdom destroyed by the Khitans in 926, including its crown prince, and pushed Goryeo’s frontier north towards the Cheongcheon River. He also supported Buddhism, founding temples in the new capital, and promoted Pyongyang, the old Goguryeo capital, as a western capital. To ease the burden on farmers after decades of war, he reduced taxes and gave relief to people who had been forced into servitude. Towards the Khitans he was openly hostile: in 942, when they sent envoys and camels, he exiled the envoys and left the camels to starve under a bridge in Gaegyeong, according to the official history.

Before his death in 943 he is said to have left Ten Injunctions to his successors, covering Buddhism, royal succession and wariness of the Khitans. The text survives in the later Goryeosa, and some historians question whether all of it is authentic.

Consequences and legacy

Wang Geon’s marriage policy left many princes with powerful maternal relatives, and succession struggles followed his death. King Gwangjong (r. 949–975) reasserted royal authority, freeing many people who had been unlawfully enslaved in 956 and introducing a Chinese-style civil service examination in 958.

Goryeo went on to become a brilliant Buddhist and aristocratic culture. It produced the famous jade-green celadon ceramics, the woodblocks of the Tripitaka Koreana, and in 1377 the Jikji, the oldest surviving book printed with movable metal type. It survived Khitan invasions and decades of Mongol domination before falling to the general Yi Seong-gye, who founded the Joseon dynasty in 1392.

Through Arab, Chinese and later European contacts, the kingdom’s name spread abroad. Forms such as “Corea” and “Korea” in Western languages derive from Goryeo.

Timeline

• 892–900: Gyeon Hwon establishes Later Baekje in the south-west.
• 901: Gung Ye proclaims Later Goguryeo.
• c. 903: Wang Geon captures the Naju region by sea.
• 918: Gung Ye is overthrown; Wang Geon founds Goryeo.
• 919: The capital moves to Songak (Gaegyeong).
• 927: Gyeon Hwon sacks Gyeongju; Goryeo is defeated at Gongsan.
• 930: Goryeo wins at Gochang (Andong).
• 935: Silla’s King Gyeongsun surrenders to Goryeo.
• 936: Victory at Illicheon destroys Later Baekje and reunifies the peninsula.
• 943: Wang Geon dies.

Why it matters

The founding of Goryeo ended a period of division and created a unified Korean state that lasted almost five centuries. By drawing together Silla, Later Baekje and Balhae refugees under one crown, it strengthened a shared Korean identity, and it gave the country the name by which most of the world still knows it.