Korean History › Three Kingdoms
Silla
57 BC (traditional) – 668, then Unified Silla· Empire, kingdom or state· Rulers & states
Mostly agreedGood evidence; some details, dates or numbers uncertain.
The kingdom based at Gyeongju that grew from a small chiefdom into the state that unified most of the peninsula by 676.
See it on the Korean History map →What happened
Silla (신라) began as Saro, a Jinhan chiefdom in the Gyeongju basin; tradition dates its founding to 57 BC under Bak Hyeokgeose, said to be born from an egg. The Bak, Seok and Kim clans shared the throne until the Kims held it from the 4th century. Isolated in the southeast, Silla developed late, then fast: a law code in 520, Buddhism in 527, the Han River in 553 and Gaya in 562. It is famed for gold crowns.
Why it matters
The weakest of the three kingdoms ended up unifying them, and its capital, Gyeongju, shaped Korean Buddhist art and aristocratic culture.
How we know
The Samguk sagi (1145) and Samguk yusa, Chinese records, stone steles such as King Jinheung's border monuments, and Gyeongju's rich tombs with gold crowns.
Still debated
Early dates are suspect: the 57 BC founding was probably pushed back to make Silla the oldest kingdom; it likely became a true state only around the 4th century.
Inside this (6)
Connections (7)
▸Buddhism in Korea was adopted in 527 by SillaWell documented
The connection
Silla's aristocrats long resisted Buddhism, which challenged their clan cults and privileges. King Beopheung backed it; tradition says the official Ichadon accepted execution in 527 to force the issue, and miracles at his death won over the nobles. Buddhism then became a state religion bolstering royal power.
When and how
Gyeongju, 527 (some sources say 528); King Beopheung and Ichadon. Earlier, the Goguryeo monk Mukhoja had preached privately in Silla.
How we know
The Samguk sagi and Samguk yusa; a stone pillar of 818 in Gyeongju depicts Ichadon's martyrdom.
Debates and open questions
The white-blood miracle is legend; historians read the episode as a power struggle between king and nobility. Sources differ on 527 or 528.
▸Hwarang (Flower Youth) corps was an elite youth corps of SillaWell documented
The connection
The hwarang bound young men of noble families to the Silla throne before they took office or command. Groups shared training, rituals and travel, building loyalty across clan lines. Many generals and ministers rose from them, giving Silla a cohesive officer class.
When and how
Formalized in 576 under King Jinheung; most active in the 6th–7th centuries, continuing later in a weaker, ceremonial form.
How we know
The Samguk sagi quotes the 9th-century scholar Choe Chi-won on the hwarang and names famous members; the Samguk yusa adds stories.
Debates and open questions
Whether the hwarang had shamanist roots, and how important they stayed after unification, are debated.
▸Bone-rank system (golpum) ranked the nobility of SillaWell documented
The connection
Bone rank sorted Silla's families into fixed tiers by birth, tying each to a ceiling of office, dress and housing. It let the royal Kim clan and allied clans share power in a set order, which helped hold together a state built from merged chiefdoms.
When and how
Took shape as Silla centralized in the early 6th century, likely formalized with King Beopheung's law code of 520.
How we know
The Samguk sagi's treatises lay out the rank limits; officials' records and inscriptions show them in practice.
Debates and open questions
Whether the system grew from older clan rankings or was imposed by kings is debated.
▸Queen Seondeok of Silla was the first reigning queen of SillaWell documented
The connection
When King Jinpyeong died in 632 without a son, the rule that kings be sacred bone left his daughter as heir. Seondeok became Silla's first ruling queen, followed by her cousin Jindeok; a third, Jinseong, reigned in the 9th century. No other Korean kingdom had a reigning queen.
When and how
632, at Gyeongju; Seondeok was Silla's 27th ruler.
How we know
The Samguk sagi and Samguk yusa record her accession; Chinese histories note Silla's female rulers.
Debates and open questions
Whether nobles saw her as a figurehead or a real ruler, and how much opposition she faced before Bidam's revolt, is debated.
▸Gaya confederacy was annexed in 562 by SillaWell documented
The connection
Squeezed between Silla and Baekje, Gaya's city-states fell one by one. Geumgwan Gaya's King Guhyeong surrendered to Silla in 532 and received noble rank; in 562 King Jinheung's general Isabu conquered Daegaya, ending Gaya. Silla gained Gaya's iron, ports and talent.
When and how
Gimhae in 532 and Goryeong in 562; Silla's King Beopheung and King Jinheung.
How we know
The Samguk sagi records both annexations; Silla-style tombs and goods replace Gaya ones across the region in the 6th century.
Debates and open questions
How much Baekje and Yamato aided Gaya against Silla, and what lies behind Japan's 'Mimana' claims, remain debated.
▸Cheomseongdae reflects the court astronomy of SillaMostly agreed
The connection
Cheomseongdae, a bottle-shaped stone tower in Gyeongju from Queen Seondeok's reign, is traditionally East Asia's oldest surviving observatory. It shows that Silla's court valued watching the sky, since omens and calendars guided farming and royal legitimacy.
When and how
Gyeongju, Silla's capital, about 632–647, during Queen Seondeok's reign.
How sure are we?
The Samguk yusa dates it to Seondeok; 'cheomseong' means star-watching; Silla sky observations are recorded in the Samguk sagi.
Debates and open questions
Whether it was a working observatory, a symbolic altar or a Buddhist-inspired monument is debated; its small top and high entrance make practical use doubtful to some.
▸Samguk sagi (History of the Three Kingdoms) is often criticized for favoring SillaMostly agreed
The connection
Kim Bu-sik, a descendant of Silla's royal family, gave Silla the earliest founding date (57 BC), the most annals (12 volumes against 10 for Goguryeo and 6 for Baekje) and treated it as the legitimate line. Kim Yu-sin's biography alone fills three of the ten biography volumes.
When and how
1145, at the Goryeo court in Kaesong, under Kim Bu-sik, who belonged to the Gyeongju Kim lineage.
How sure are we?
The volume counts and comments are in the text. Critics from the 20th-century historian Shin Chae-ho onward have pointed to its Silla-centered and pro-China slant.
Debates and open questions
Defenders note that Silla's records survived best because it lasted longest, and that Kim also honored Goguryeo and Baekje heroes; how deliberate the bias was is debated.