Theme: Korea Plan

History
Prehistory and Gojoseon
The Korean Academy claimed ancient hominid fossils originating from about 100,000 BCE in the lava at a stone city site in Korea. Fluorescent and high-magnetic analyses indicate the volcanic fossils may be from as early as 300,000 BCE. The best preserved Korean pottery goes back to the paleolithic times around 10,000 BCE and the Neolithic period begins around 6000 BCE.
According to legend, Dangun, a descendant of Heaven, established Gojoseon in 2333 BCE. In 108 BCE, the Han dynasty defeated Gojoseon and installed four commanderies in the northern Korean peninsula. Three of the commanderies fell or retreated westward within a few decades, but the Lelang Commandery remained as a center of cultural and economic exchange with successive Chinese dynasties for four centuries. By 313, Goguryeo annexed all of the Chinese commanderies.
Proto–Three Kingdoms
The Proto–Three Kingdoms period, sometimes called the Multiple States Period, is the earlier part of what is commonly called the Three Kingdoms Period, following the fall of Gojoseon but before Goguryeo, Baekje, and Silla fully developed into kingdoms.
This time period saw numerous states spring up from the former territories of Gojoseon, which encompassed northern Korea and southern Manchuria. With the fall of Gojoseon, southern Korea entered the Samhan period.
Located in the southern part of the Korean Peninsula, Samhan refers to the three confederacies of Mahan, Jinhan, and Byeonhan. Mahan was the largest and consisted of 54 states. Byeonhan and Jinhan both consisted of twelve states, bringing a total of 78 states within the Samhan. These three confederacies eventually developed into Baekje, Silla, and Gaya.
Three Kingdoms

7th century Tang dynasty painting of envoys from the Three Kingdoms of Korea: Baekje, Goguryeo, and Silla
The Three Kingdoms of Korea consisted of Goguryeo, Silla, and Baekje. Silla and Baekje controlled the southern half of the Korean Peninsula, maintaining the former Samhan territories, while Goguryeo controlled the northern half of the Korean Peninsula, Manchuria and the Liaodong Peninsula, uniting Buyeo, Okjeo, Dongye, and other states in the former Gojoseon territories.^[21]
Goguryeo was a highly militaristic state; it was a powerful empire and one of the great powers in East Asia, reaching its zenith in the 5th century when its territories expanded to encompass most of Manchuria to the north, parts of Inner Mongolia to the west, parts of Russia to the east, and the Seoul region to the south. Goguryeo experienced a golden age under Gwanggaeto the Great and his son Jangsu, who both subdued Baekje and Silla during their times, achieving a brief unification of the Three Kingdoms of Korea and becoming the most dominant power on the Korean Peninsula. In addition to contesting for control of the Korean Peninsula, Goguryeo had many military conflicts with various Chinese dynasties, most notably the Goguryeo–Sui War, in which Goguryeo defeated a huge force said to number over a million men. In 642, the powerful general Yeon Gaesomun led a coup and gained complete control over Goguryeo. In response, Emperor Tang Taizong of China led a campaign against Goguryeo, but was defeated and retreated. After the death of Tang Taizong, his son Emperor Tang Gaozong allied with the Korean kingdom of Silla and invaded Goguryeo again, but was unable to overcome Goguryeo's stalwart defenses and was defeated in 662. However, Yeon Gaesomun died of a natural cause in 666 and Goguryeo was thrown into chaos and weakened by a succession struggle among his sons and younger brother, with his eldest son defecting to Tang and his younger brother defecting to Silla. The Tang-Silla alliance finally conquered Goguryeo in 668. After the collapse of Goguryeo, Tang and Silla ended their alliance and fought over control of the Korean Peninsula. Silla succeeded in gaining control over most of the Korean Peninsula, while Tang gained control over Goguryeo's northern territories. However, 30 years after the fall of Goguryeo, a Goguryeo general by the name of Dae Joyeong founded the Korean-Mohe state of Balhae and successfully expelled the Tang presence from much of the former Goguryeo territories.

Seokguram Grotto from the Silla era, a UNESCO World Heritage Site
The southwestern Korean kingdom of Baekje was founded around modern-day Seoul by a Goguryeo prince, a son of the founder of Goguryeo. Baekje absorbed all of the Mahan states and subjugated most of the western Korean peninsula (including the modern provinces of Gyeonggi, Chungcheong, and Jeolla, as well as parts of Hwanghae and Gangwon) to a centralised government; during the expansion of its territory, Baekje acquired Chinese culture and technology through maritime contacts with the Southern Dynasties. Baekje was a great maritime power; its nautical skill, which made it the Phoenicia of East Asia, was instrumental in the dissemination of Buddhism throughout East Asia and continental culture to Japan. Historic evidence suggests that Japanese culture, art, and language were influenced by the kingdom of Baekje and Korea itself; Baekje also played an important role in transmitting advanced Chinese culture to the Japanese archipelago. Baekje was once a great military power on the Korean Peninsula, most notably in the 4th century during the rule of Geunchogo when its influence extended across the sea to Liaoxi and Shandong in China, taking advantage of the weakened state of Former Qin, and Kyushu in the Japanese archipelago; however, Baekje was critically defeated by Gwanggaeto the Great and declined.

The Three Kingdoms of Korea, at the end of the 5th century
Although later records claim that Silla was the oldest of the Three Kingdoms of Korea, it is now believed to have been the last kingdom to develop. By the 2nd century, Silla existed as a large state in the southeast, occupying and influencing its neighboring city-states. In 562, Silla annexed the Gaya confederacy, which was located between Baekje and Silla. The Three Kingdoms of Korea often warred with each other and Silla was often dominated by Baekje and Goguryeo. Silla was the smallest and weakest of the three, but it used cunning diplomatic means to make opportunistic pacts and alliances with the more powerful Korean kingdoms, and eventually Tang China, to its great advantage. In 660, King Muyeol ordered his armies to attack Baekje. General Kim Yu-shin, aided by Tang forces, conquered Baekje after defeating General Gyebaek at the Battle of Hwangsanbeol. In 661, Silla and Tang attacked Goguryeo but were repelled. King Munmu, son of Muyeol and nephew of General Kim Yu-shin, launched another campaign in 667 and Goguryeo fell in the following year.