In the (Chinese) Records of the Three Kingdoms, there are sources from older texts which describe the kingdoms and tribes outside of China. There are many interesting accounts which give an outsider’s perspective on the different tribes and countries in the Korean peninsula and in Manchuria. Buyeo was depicted as a nation of friendly people, polite and “always singing.” The historian did note, however, the draconian nature of their laws; the punishment for murder was death and having the entire family of the murderer enslaved. Even more bizarre was the punishment for “jealousy.” The woman (it was always a woman) would be put to death and her corpse exposed to the elements. Her family would have to pay a fine to recover the corpse. Whatever Buyeo meant by jealousy, you didn’t want to be caught doing it.
The writer of the accounts noted that the people of Goguryeo had many different spirits they appeased to. They are boisterous, loving to sing and dance and get into fights. The writer did not like Goguryeo’s marriage customs, which involved the wife’s family building a hut behind their house, where the husband and wife spend the night; the husband and wife go to the husband’s home only after the kids have grown up. Oh, and they brewed great beer, apparently.
The accounts go on to depict the Okjae tribes, the Ye and even the people of Samhan. Although the records sometimes have the air of an outsider who doesn’t quite understand what is going on in a foreign country, they are a great source of history for the area. But one is struck at what the records conspicuously left out: any major account of Silla and Baekje.
Silla and Baekje occupied the areas of the Samhan confederacies. We now know how important those two kingdoms are going to be thanks to the power of historical hindsight. In the first few centuries, there was nothing to distinguish them from the other tribes, including the Gaya confederacies. They were certainly not anyone near the strength of Goguryeo, the regional power. So in the old records, Silla and Baekje were lumped together with the other countries and chieftains. Things were about to change in the year 234 with the ascension of King Go-I of Baekje.
When Soseono and her two children, Biryu and Onjo, went deeper south to found a new state, Onjo’s Baekje was the result. For the first two centuries of its existence, Baekje fended off multiple attacks from the Han Commanderies and the Malgal, a semi-nomadic tribe around the area. Onjo himself had pulled a successful attack against the king of Mahan, and the state of Baekje was slowly absorbing the confederacies of the area. Thus Baekje was a mix of Goguryeo descendants and the local Mahan people, and two languages appear to have been spoken in the state. Despite the records of natural disasters or attacks from Lelang and Malgal, the first years of Baekje were fairly stable. As the excellent Topics in Korean History podcast points out, the first kings of Baekje had incredibly long reigns, far longer than the average, so they must have been doing something different. The average length of a rule was about 40 years.
Then came King Saban, who ruled for a grand total of less than a year. In 234 he assumed power after his father’s death, but then was removed almost immediately afterwards. The reason was he was too young to be leader, and was replaced by King Go-I. He claimed to be the younger son of an earlier king, Gaeru. However, this was most likely a fabrication to justify his usurpation. Being Gaeru’s son would’ve meant that Go-I lived to be older than 120 years. Long lived or not, this is a little too much even by Baekje standards.
The King took power in the same year Saban stepped down, in 234. Saban left Korean history to enter the history of Japan. Meanwhile, Go-I began his project of making something out of the little Baekje he just took over. He didn’t waste any time working on his country, so that when the chaos erupted up north in 246, with the Goguryeo-Wei war, Baekje was ready.
When the commanderies of Lelang and Daifang joined the Wei to fight Goguryeo, Baekje saw this as an opportunity to strike at their northern neighbors. They attacked Lelang and took many hostages. However, for reasons unknown, King Go-I decided to send those prisoners of war back. Daifang struck back, but they were surprised to discover that this little state had enough strength to defeat the joint power of the commanderies, even killing the Daifang governer in battle. Baekje was no longer a little walled state to be pushed around.
Having won the battle, Baekje developed a more complicated relationship with the two commanderies. Despite these conflicts, the relationship between Baekje and Daifang went smoothly afterwards, as Go-I’s son married a princess from Daifang, and Baekje would help the Commanderies in their other expeditions. This was an example of the diplomacy which Baekje was famous for. During it’s rise to power as a kingdom, Baekje was more outward looking than the other two kingdoms, eagerly entering into alliances and trade relationships with Japan and the various Chinese kingdoms. This outward looking diplomacy was the source of Baekje’s strength.
King Go-I also set up a system to centralize his state. This was the beginning of Baekje’s court system, which would eventually divide the court into sixteen posts, with three tiers each. Each tier was supposed to show up to court dressed up in full regalia, and the colors were divided by rank. The upper ranks wore purple, the middle ranks scarlet, and the lower ranks blue. Go-I enacted strict laws against corruption, and anyone caught taking bribes was severely punished. All this gave the appearance of a fresh official court ready to become its own kingdom.
The expansionist tendencies of Go-I and his successors is the subject of a controversy. Namely, did Baekje ever colonize parts of China? Some people believe Baekje had a “Greater Baekje” period, where the country had an Eastern and Western side. The Western half was across from the Korean peninsula and into parts of China. Official histories nowadays reject the idea. One of the first objections goes as far back as the 18th century, when a scholar from Joseon tried to disprove the theory that Baekje had any posts in Chinese territory. If a 18th century scholar had to reject the theory, it means that the idea has been around for a long time. Where did it come from?
Korean records like the Samguk Sagi make absolutely no mention of Greater Baekje. What little evidence we have comes from references to Baekje occupying the Laioxi region, references found in Chinese sources. This occupation would have taken place during the Jin Dynasty, so any time between 266 and 420. This would coincide with Go-I and his successors’ plans of expansionism. On the other hand, there are also other Chinese records that have no such claim, including, most tellingly of all, the records from Jin. With the absence of any conclusive evidence, the “Greater Baekje” hypothesis is one left to speculation and Internet flame wars.
For Go-I’s efforts to solidify his country, he was considered the founder of Baekje, and ancestral festivals were dedicated to him. The King set Baekje on the path to become a power of the region, a path that moved northwards, and that his descendants would quickly take up.