Kaya confederacy

Languages

Linguists, including Vovin and Janhunen, suggest that Japonic languages were spoken in large parts of the southern Korean Peninsula. According to Vovin, these "Peninsular Japonic languages" were replaced by Koreanic-speakers (possibly belonging to the Han-branch).

The later Gaya language likely belonged to the Koreanic Han languages.

The genetic diversity in the Kaya kingdom region is linked to Jomon-related ancestry.

History

According to a legend written in the Samguk yusa in the 13th century, six eggs descended from heaven in the year AD 42 with a message that they would be kings. Six boys were born and matured within 12 days. One of them, named Suro, became the king of Geumgwan Gaya, and the other five founded the remaining five Gayas: Daegaya, Seongsan Gaya, Ara Gaya, Goryeong Gaya, and Sogaya.

The Kaya polities evolved out of the chiefly political structures of the twelve tribes of the ancient Byeonhan confederacy, one of the Samhan confederacies. The loosely organized chiefdoms resolved into six Kaya groups, centered on Geumgwan Kaya. Based on archaeological sources and the limited written records, scholars have identified the late 3rd century as a period of transition from Byeonhan to Kaya, noting increasing military activity and changing funerary customs. This transition was also associated with the replacement of the previous elite in some principalities (including Daegaya) by elements from the Buyeo kingdom, which brought a more militaristic ideology and style of rule.

After the Eight Port Kingdoms War (浦上八國 亂) (c. 209 – c. 212) between Silla and Kaya, Kaya was influenced by Silla's southeast peninsular hegemony, but diplomatically utilized the influence of Paekche and Japan to maintain independence. The Kaya confederacy disintegrated under pressure from Goguryeo between 391 and 412, although the last Kaya polities remained independent until they were conquered by Silla in 562, as punishment for assisting Paekche in a war against Silla.

In 529, Silla destroyed Takgitan Gaya (啄己呑國) under the pretext of its alliance with Daegaya and took half of Taksun Gaya's (卓淳國) territory. This led Daegaya to distrust the Kaya and begin uniting around the Ara Gaya, which was maintaining a strong power. In order to escape interference between Paekche and Silla in Kaya, the Ara Gaya invited Silla, Paekche, and Japan to hold the Anra Conference (安羅會議). Although they wanted to pressure Silla through the meeting to rebuild the Takgitan Kaya (啄己呑國) and raise the international status of Anra, Paekche preferred strong diplomacy and Silla was not interested in it. Although Japan was pro-Anra Gaya, it was unable to help due to internal problems.

In 541 and 544, Paekche led the Sabi Conferences (泗沘會議), which were participated in by seven countries including Ara. However, Ara still did not fully trust in Paekche. As a result of the conference, Kaya attacked Goguryeo alongside the Silla-Paekche alliance and acquired Seoul. In this attack, Paekche was betrayed by Silla and Kaya was also absorbed by Silla.

Economy

Polities were situated in the alluvial flats of tributary river valleys and the mouth of the Nakdong. In particular, the mouth of the Nakdong has fertile plains, direct access to the sea, and rich iron deposits. Kaya polities had economies that were based on agriculture, fishing, casting, and long-distance trade. They were particularly known for its iron-working, as Byeonhan had been before it. Kaya polities exported abundant quantities of iron ore, iron armor, and other weaponry to Paekche and the Kingdom of Wa. In contrast to the largely commercial and non-political ties of Byeonhan, Kaya polities seem to have attempted to maintain strong political ties with those kingdoms as well.

Politics

Several ancient historical records list a number of polities of Kaya. For example, Goryeo Saryak (고려사략; 高麗史略) lists five: Geumgwan Gaya, Goryeong Gaya, Bihwa Gaya, Ara Gaya, and Seongsan Gaya.

Traditionally, the Kaya confederacy enjoyed good relations with Japan and Paekche, such as when the three states allied against Goguryeo and Silla in the Goguryeo-Wa War. Records indicate Kaya would, alongside Paekche, regularly send economic, cultural, and technological aid to Japan in exchange for military and political aid, as the Yamato court desired technological progress and cultural advancement while Paekche and the Kaya states desired Japan's military aid in their wars against Silla and Goguryeo.

The various Kaya polities formed a confederacy in the 2nd and 3rd centuries that was centered on the heartland of Geumgwan Gaya in modern Gimhae. After a period of decline, the confederacy was revived around the turn of the 5th and 6th centuries, this time centered on Daegaya of modern Goryeong. However, it was unable to defend itself against the incursions and attacks of the neighboring kingdom of Silla. Eventually, all of the Kaya confederacy was absorbed into Silla.

After the fall of the Kaya confederacy, many of the nobility and elite of the confederated states were integrated into the ranks of Silla's bone-rank system including the royal houses of the defeated Kaya confederacy. One such example was the Sillan General Kim Yu-sin who played a critical role in the unification of the Three Kingdoms of Korea. Kim was the great-grandchild of King Guhae of Geumgwan Kaya, the last ruler of the Geumgwan Kaya state. As a result, Kim was given the rank of "true bone" which was the second highest rank one could attain, in part because the royal family of Geungwan Kaya, the Gimhae Kim clan were intermarried with the Gyeongju Kim clan, which was a prominent noble house in Silla.

Member statelets

• Geumgwan Gaya/Garak state
• Daegaya/Banpa state
• Sogaya/Goja state
• Ara Gaya/Alla state
• Seongsan Gaya/Byeokjin state
• Goryeong Gaya
• Bihwa Gaya/Biji state, occasionally classified as the member of Jinhan confederacy.

Mimana/Imna controversy

Political and trade relations with Japan have been a source of controversy in both Korea and Japan. Japanese publicists during the twentieth century looked to the Nihon Shoki, which claims that Kaya (named "Mimana" also "Kara" in Japanese) was a military outpost of Japan during the Yamato period (300–710). While there is no evidence to support this, the claim has nonetheless been advocated at various times by Japanese imperialists, nationalists and press to justify the Japanese colonial rule of Korea between 19th and 20th centuries.

Archaeological evidence suggests that Kaya polities were the main exporter of technology and culture to Kyushu at that time. The theory of a Japanese outpost is widely rejected in Korea and Japan as there were no Japanese local groups at the time that had a strong enough military power to conquer Kaya or any other part of Korea. The technology of Kaya was more advanced than that of the Japanese dynasties of the time.

Though this theory has been largely refuted since the 1970s, it remains a sensitive and re-occurring issue in modern-day.

In 2010, a joint study group of historians sponsored by the governments of Japan and South Korea agreed that Kaya had never been militarily colonized by ancient Japan.