Korean History › Three Kingdoms
Silla's wars of unification
660–676· War· Wars & invasions
Well documentedSolid records, physical evidence or scientific consensus.
From 660 to 676 Silla, first allied with Tang China and then fighting it, ended the Three Kingdoms period.
See it on the Korean History map →What happened
Silla's wars of unification (삼국통일전쟁) came in three stages. In 660 Silla and Tang destroyed Baekje, then crushed a Baekje revival backed by Japan by 663. In 668 they took Goguryeo's capital, Pyongyang. From 670 Silla fought its former ally, which wanted to rule the whole peninsula, and by 676 pushed Tang out. Silla ended up holding the land south of roughly the Taedong River and Wonsan Bay; Goguryeo's northern lands later became largely Balhae.
Why it matters
It created the first single state on most of the peninsula, laying a base for a shared Korean language and identity.
How we know
The Samguk sagi, Tang histories and Japan's Nihon shoki, along with excavated fortresses, inscriptions and battle sites.
Still debated
Some historians, especially in North Korea, say 'unification' overstates it, since Goguryeo's north became Balhae; many prefer 'North–South States period.'
Inside this (6)
Connections (4)
▸King Munmu of Silla completed Silla's wars of unificationWell documented
The connection
Munmu inherited the war in 661 with Baekje beaten but Goguryeo standing. He crushed Baekje's revival by 663, joined the 668 conquest of Goguryeo, then fought Tang until 676. By the end, Silla alone held the peninsula south of the Taedong River.
When and how
661–676, across the peninsula; Munmu led armies himself, with Kim Yu-sin advising until his death in 673.
How we know
The Samguk sagi's annals of his reign record each campaign; his 671 letter lays out Silla's case against Tang.
Debates and open questions
Whether Munmu planned from the start to expel Tang, or reacted to Tang's ambitions, is debated.
▸Silla's wars of unification created Unified SillaWell documented
The connection
The wars turned Silla from one of three kingdoms into the ruler of most of the peninsula. It absorbed Baekje and southern Goguryeo lands and people, gave some former enemies ranks in its system, and reorganized its territory into nine provinces in the 680s.
When and how
668 to the 680s, from Goguryeo's fall through King Sinmun's reorganization, run from the capital, Gyeongju.
How we know
The Samguk sagi records the new provinces, army units and ranks for Baekje and Goguryeo people; administrative sites and inscriptions confirm them.
Debates and open questions
Whether 668 or 676 marks the true start of 'Unified Silla' is a matter of convention; some historians call the unification only partial.
▸Kim Yu-sin commanded Silla's armies in Silla's wars of unificationWell documented
The connection
Kim Yu-sin was Silla's top general in the decisive years. He led the 660 march on Baekje, delivered grain to the Tang army at Pyongyang in 662, and helped plan the campaigns against Goguryeo. By 668 he was too old to march but was honored as the war's chief architect.
When and how
660–668, from Hwangsanbeol to Pyongyang; he died in 673, before the Silla–Tang War ended.
How we know
The Samguk sagi's three-chapter biography and royal annals; his special rank, taedaegakgan, was granted in 668.
Debates and open questions
Because his biography came from a family record, his personal share of the credit may be enlarged.
▸Silla's wars of unification ended with Silla–Tang WarWell documented
The connection
Once Baekje and Goguryeo were gone, the allies' goals split. Tang wanted to rule the whole peninsula; Silla wanted its promised share and more. The unification wars thus ended with Silla fighting its former partner, a war that decided who would really control Korea.
When and how
670–676, from Silla's backing of Goguryeo rebels to the naval battle at Gibeolpo.
How we know
The Samguk sagi and Tang histories both record the turn from alliance to war.
Debates and open questions
Whether Tang always meant to absorb Silla, or reacted to Silla's moves, is debated.