Silla in the context of Samguk sagi

South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and the Sea of Japan to the east. Like North Korea, South Korea claims to be the sole legitimate government of the entire peninsula and adjacent islands. It has a population of about 52 million, of which half live in the Seoul metropolitan area, the ninth most populous metropolitan area in the world; other major cities include Busan, Daegu, and Incheon.

The Korean Peninsula was inhabited as early as the Lower Paleolithic period. Its first kingdom was noted in Chinese records in the early seventh century BC. From the mid first century BC, various polities consolidated into the rival kingdoms of Goguryeo, Baekje, and Silla. The lattermost eventually unified most of the peninsula for the first time in the late seventh century AD, while Balhae succeeded Goguryeo in the north. The Goryeo dynasty (918–1392) achieved lasting unification and established the basis for the modern Korean identity. The subsequent Joseon dynasty (1392–1897) generated cultural, economic, and scientific achievements and also established isolationism starting from the mid-17th century. The succeeding Korean Empire (1897–1910) sought modernization and reform but was annexed in 1910 into the Empire of Japan. Japanese rule ended following Japan's surrender in World War II, after which Korea was divided into two zones: the Soviet-occupied northern zone and the United States-occupied southern zone. After negotiations on reunification failed, the southern zone became the Republic of Korea in August 1948, while the northern zone became the communist Democratic People's Republic of Korea the following month.

Korea is a peninsular region in East Asia consisting of the Korean Peninsula, Jeju Island, and smaller islands. Since the end of World War II in Asia in 1945, it has been politically divided at or near the 38th parallel between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK). Both countries proclaimed independence in 1948, and the two countries fought the Korean War from 1950 to 1953. The region is bordered by China to the north and Russia to the northeast, across the Amnok (Yalu) and Duman (Tumen) rivers, and is separated from Japan to the southeast by the Korea Strait.

Known human habitation of the Korean peninsula dates to 40,000 BC. The kingdom of Gojoseon, which according to tradition was founded in 2333 BC, fell to the Han dynasty in 108 BC. It was followed by the Three Kingdoms period, in which Korea was divided into Goguryeo, Baekje, and Silla. In 668 AD, Silla conquered Baekje and Goguryeo with the aid of the Tang dynasty, forming Unified Silla; Balhae succeeded Goguryeo in the north. In the late 9th century, Unified Silla collapsed into three states, beginning the Later Three Kingdoms period. In 918, Goguryeo was resurrected as Goryeo, which achieved what has been called a "true national unification" by Korean historians, as it unified both the Later Three Kingdoms and the ruling class of Balhae after its fall. Goryeo, whose name developed into the modern exonym "Korea", was highly cultured and saw the invention of the first metal movable type. During the 13th century, Goryeo became a vassal state of the Mongol Empire. Goryeo overthrew Mongol rule before falling to a coup led by General Yi Seong-gye, who established the Joseon dynasty in 1392. The first 200 years of Joseon were marked by peace; the Hangul, the Korean alphabet was created and Confucianism became influential. This ended with Japanese and Qing invasions, which brought devastation to Joseon and led to Korean isolationism. After the invasions, an isolated Joseon experienced another nearly 200-year period of peace and prosperity, along with cultural and technological development. In the final years of the 19th century, Japan forced Joseon to open up and Joseon experienced turmoil such as the Kapsin Coup, Donghak Peasant Revolution, and the assassination of Empress Myeongseong. In 1895, Japan defeated China in the First Sino-Japanese War and China lost suzerainty over Korea and Korea was placed under further Japanese influence. In 1897, the centuries old Joseon was replaced by the Korean Empire with the Joseon's last king, Gojong, becoming the Emperor of the Korean Empire. Japan's further victory in the 1904–1905 Russo-Japanese War, expelled Russian influence in Korea and Manchuria. In 1905, the Korean Empire became a protectorate of the Empire of Japan. In 1910, the Empire of Japan officially annexed the Korean peninsula.

Paekche or Baekje (Korean: 백제; Hanja: 百濟; RR: Baekje; MR: Paekche; pronounced [pɛk̚.tɕ͈e]) was a Korean kingdom located in southwestern Korea from 18 BCE to 660 CE. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla. While the three kingdoms were in separate existence, Baekje had the highest population of approximately 3,800,000 people (760,000 households), which was much larger than that of Silla (850,000 people) and similar to that of Goguryeo (3,500,000 people).

Baekje was founded by Onjo, the third son of Goguryeo's founder Jumong and Soseono, at Wiryeseong (present-day southern Seoul). Baekje, like Goguryeo, claimed to succeed Buyeo, a state established in present-day Manchuria around the time of Gojoseon's fall.

The tributary system of China (simplified Chinese: 中华朝贡体系, traditional Chinese: 中華朝貢體系, pinyin: Zhōnghuá cháogòng tǐxì), or Cefeng system (simplified Chinese: 册封体制; traditional Chinese: 冊封體制; pinyin: Cèfēng tǐzhì) at its height was a network of loose international relations centered around China which facilitated trade and foreign relations by acknowledging China's hegemonic role within a Sinocentric world order. It involved multiple relationships of trade, military force, diplomacy and ritual. The other states had to send a tributary envoy to China on schedule, who would kowtow to the Chinese emperor as a form of tribute, and acknowledge his superiority and precedence. The other countries followed China's formal ritual in order to keep the peace with the more powerful neighbor and be eligible for diplomatic or military help under certain conditions. Political actors within the tributary system were largely autonomous and in almost all cases virtually independent.

Scholars differ on the nature of China's relations with its neighbors in traditional times. Many describe a system that embodied a collection of institutions, social and diplomatic conventions, and institutions that dominated China's contacts with the non-Chinese world for two millennia, until the collapse of the system around the end of the 19th century. Other scholars like Odd Arne Westad see a variety of relationships that differed in character, not an overall "tributary system". They suggest a Sinocentric system, in which Chinese culture was central to the self-identification of many elite groups in the surrounding Asian countries. By the late 19th century, China had become part of a European-style community of sovereign states and established diplomatic relations with other countries in the world following international law. While some scholars have suggested that the tributary system is a model for understanding international relations in East Asia today, other scholars have argued that the concept is misleading about relations in both early modern times and today.

The Three Kingdoms of Korea or Samhan (Goguryeo, Paekche and Silla) competed for hegemony over the Korean Peninsula during the ancient period of Korean history. During the Three Kingdoms period (Korean: 삼국 시대), many states and statelets consolidated until, after Buyeo was annexed in 494 and Gaya was annexed in 562, only three remained on the Korean Peninsula: Goguryeo, Paekche and Silla. The "Korean Three Kingdoms" contributed to what would become Korea; and the Goguryeo, Paekche and Silla peoples became the Korean people.

The three kingdoms occupied the entire peninsula and roughly half of Manchuria (modern-day Northeast China and small parts of the Russian Far East). Goguryeo controlled the northern half of the peninsula, as well as Liaodong Peninsula and Manchuria. Paekche and Silla occupied the southern half of the peninsula. The island kingdoms of Tamna and Usan were subordinated to Paekche and Silla, respectively.

Unified Silla, or Late Silla, is the name often applied to the historical period of the Korean kingdom of Silla after its conquest of Goguryeo in 668 AD, which marked the end of the Three Kingdoms period. In the 7th century, a Silla–Tang alliance conquered Baekje in the Baekje–Tang War. Following the Goguryeo–Tang War and Silla–Tang War in the 7th century, Silla annexed the southern part of Goguryeo, unifying the central and southern regions of the Korean peninsula.

Unified Silla existed during the Northern and Southern States period at a time when Balhae controlled the north of the peninsula. Unified Silla lasted for 267 years until it fell to Goryeo in 935 during the reign of King Gyeongsun.

Goryeo (Korean: 고려; Hanja: 高麗; MR: Koryŏ; pronounced [ko.ɾjʌ]; Middle Korean: 고ᇢ롕〮, romanized: kwòwlyéy) was a Korean state founded in 918, during a time of national division called the Later Three Kingdoms period, that unified and ruled the Korean Peninsula until the establishment of Joseon in 1392. Goryeo achieved what has been called a "true national unification" by Korean historians as it not only unified the Later Three Kingdoms but also incorporated much of the ruling class of the northern kingdom of Balhae, who had origins in Goguryeo of the earlier Three Kingdoms of Korea. According to Korean historians, it was during the Goryeo period that the individual identities of Goguryeo, Baekje and Silla were successfully merged into a single entity that became the basis of the modern-day Korean identity. The name "Korea" is derived from the name of Goryeo, also romanized as Koryŏ, which was first used in the early 5th century by Goguryeo; Goryeo was a successor state to Later Goguryeo and Goguryeo.

Goryeo was established in 918 when general Wang Kŏn, after rising under the erratic Taebong ruler Kung Ye, was chosen by fellow generals to replace him and restore stability. Throughout its existence, Goryeo, alongside Unified Silla, was known to be the "Golden Age of Buddhism" in Korea. As the state religion, Buddhism achieved its highest level of influence in Korean history, with 70 temples in the capital alone in the 11th century. Commerce flourished in Goryeo, with merchants coming from as far as the Middle East. The capital in modern-day Kaesong, North Korea was a center of trade and industry. Goryeo was a period of great achievements in Korean art and culture.

Goguryeo (37 BC – 668 AD) (Korean: 고구려; Hanja: 高句麗; RR: Goguryeo; lit. high castle; Korean pronunciation: [ko̞.ɡu.ɾjʌ̹]; Old Korean: Guryeo) also later known as Goryeo (Korean: 고려; Hanja: 高麗; RR: Goryeo; lit. high and beautiful; Korean pronunciation: [ko.ɾjʌ]; Middle Korean: 고ᇢ롕〮, kwòwlyéy), was a Korean kingdom which was located on the northern and central parts of the Korean peninsula and the southern and central parts of modern-day Northeast China (Manchuria). At its peak of power, Goguryeo encompassed most of the Korean peninsula and large parts of Manchuria, along with parts of eastern Mongolia, Inner Mongolia, and modern-day Russia.

Along with Baekje and Silla, Goguryeo was one of the Three Kingdoms of Korea. It was an active participant in the power struggle for control of the Korean peninsula and was also associated with the foreign affairs of neighboring polities in China and Japan.

Samguk yusa (Korean: 삼국유사; Hanja: 三國遺事; lit. Memorabilia of the Three Kingdoms) Korean pronunciation: [sʰam.ɡuk̚.ju.sa]) is a collection of legends, folktales, and historical accounts relating to the Three Kingdoms of Korea (Goguryeo, Baekje, and Silla), as well as to other periods and states before, during, and after the Three Kingdoms period. It was compiled by the Buddhist monk Il-yeon in the late Goryeo dynasty, around 1280, and was originally written in Classical Chinese. It is the earliest extant record of the Dangun legend, which records the founding of Gojoseon as the first Korean nation. Samguk yusa is National Treasure No. 306.

Samguk yusa is a history record composed of five volumes divided into nine parts. It documents various tales and legends which are categorized into two parts: historical events and Buddhist narratives. The text contains various historical narratives such as tales of the Three Kingdoms period, myths, legends, genealogies, histories, and Buddhist tales, which have helped maintain folklore from medieval Korea. "Yusa" is a term used to describe a text that is supplementary to an earlier work. Samguk yusa is intended to provide additional information to texts such as the Samguk sagi. The beginning of Samguk yusa describes Dangun Wanggeom, a mythological ancestor of all Koreans, founding the first nation of Korea, named Gojoseon. The text also contains several well-known tales such as "Choshin's Dream" and "Lady Suro".

The Proto–Three Kingdoms period (or Samhan period) refers to the proto-historical period in the Korean Peninsula, after the fall of Gojoseon and before the maturation of Goguryeo, Baekje, and Silla into full-fledged kingdoms. It is a subdivision of what is traditionally called Korea's Three Kingdoms period and covers the first three centuries of the Common Era, corresponding to the later phase of the Korean Iron Age.

Korean Buddhism began in the 4th century CE during the Three Kingdoms Period. Centuries after Buddhism originated in India, the Mahayana tradition arrived in China through the Silk Road in the 1st century CE, then entered the Korean peninsula in the 4th century, from where it was transmitted to Japan. In Korea, it was adopted as the state religion of 3 constituent polities of the Three Kingdoms Period, first by the Goguryeo (also known as Goryeo) in 372 CE, by the Silla (Gaya) in 528 CE, and by the Baekje in 552 CE.

Korean Buddhism is distinguished from other forms of Buddhism by its attempt to resolve what its early practitioners saw as inconsistencies within the Mahayana Buddhist traditions that they received from foreign countries. To address this, they developed a new holistic approach to Buddhism that became a distinct form, an approach characteristic of virtually all major Korean thinkers. The resulting variation is called Tongbulgyo ("interpenetrated Buddhism"), a form that sought to harmonize previously arising disputes among scholars (a principle called hwajaeng 和諍).

Korean mythology (Korean: 한국 신화; Hanja: 韓國神話) is the group of myths told by historical and modern Koreans. There are two types: the written, literary mythology in traditional histories, mostly about the founding monarchs of various historical kingdoms, and the much larger and more diverse oral mythology, mostly narratives sung by shamans or priestesses (mansin) in rituals invoking the gods and which are still considered sacred today.

The historicized state-foundation myths representing the bulk of the literary mythology are preserved in Hanja literary works such as Samguk sagi and Samguk yusa. One state's foundation myth, that of the first Korean kingdom of Gojoseon by legendary king Dangun, has become the founding myth of the whole Korean nation. State-foundation myths are further divided into northern, such as that of the kingdom of Goguryeo and its founder Jumong, where the founder is the son of a celestial male figure and an earthly female figure, and southern, such as that of the kingdom of Silla and its founder Hyeokgeose, where the founder begins as an object descended from the heavens, and himself marries an earthly woman. Other literary myths include the origin myths of family lineages recorded in genealogies.

In Japanese religion, Yahata (八幡神, ancient Shinto pronunciation) formerly in Shinto and later commonly known as Hachiman (八幡神, Japanese Buddhist pronunciation) is the syncretic divinity of archery and war, incorporating elements from both Shinto and Buddhism. His title that was given Great Bodhisattva of National Protection and Marvelous Spirit Power (護国霊験威力神通大菩薩).

The first mention of this kami is found in the Shoku Nihongi as it contains the information that offerings were sent 794 CE to Hachiman shrines on the occasion of conflict with the kingdom Silla in Korea.

The Kaya confederacy (Korean: 가야; Hanja: 加倻; pronounced [ka.ja]), also romanized as Gaya confederacy, was a Korean confederacy of territorial polities in the Nakdong River basin of southern Korea, growing out of the Byeonhan confederacy of the Samhan period.

The traditional period used by historians for Kaya chronology is AD 42–532. Geumgwan Kaya, the ruling state of the confederacy, was conquered in 532 and the last holdout, Daegaya fell in 562. According to archaeological evidence in the third and fourth centuries some of the city-states of Byeonhan evolved into the Kaya confederacy, which was later annexed by Silla, one of the Three Kingdoms of Korea. The individual polities that made up the Kaya confederacy have been characterized as small city-states. The material culture remains of Kaya culture mainly consist of burials and their contents of mortuary goods that have been excavated by archaeologists. Archaeologists interpret mounded burial cemeteries of the late third and early fourth centuries such as Daeseong-dong in Gimhae and Bokcheon-dong in Busan as the royal burial grounds of Kaya polities.