In this paper, through ancient tombs excavated in Gimhae, the centre of Gaya, a cataclysmic aspect of society and population at a turning point from the Former Gaya to the Later Gaya was studied, and this also revealed the aspect of society of the Former Gaya to academia that had scant awareness. First, the meaning of a turning point of Gaya was defined. About half century from the attack southern part of the Great King Guanggaeto in 400 A.D to the construction of the South Tomb of HuangNam Great Tombs in 458 A.D was separated into three periods, and there were two bifurcations, the dissolution of the Former Gaya and the establishment of the Later Gaya. It is also a process that hegemony of Yeongnan area was passed from the Former Gaya on to Silla. For research, the wooden chamber tomb and the stone lined tomb which were the main tombs of Gimhae area were reexamined. The system problem and the main-additional chamber tomb problem were also indicated. Especially, the stone lined tomb were separated into two systems: a wide tomb with wooden covers and a narrow tomb with stone covers. They were developed from a wooden chamber tomb and a former stone coffin tomb each. About the elite tomb of Gaya, a wooden chamber tomb of Daesungdong was main in the Former Gaya, and the two different stone lined tombs were combined in Bokcheondong site, and it became the main elite tomb of the Later Gaya. This intended change happened at a turning point from the Former Gaya to the Later Gaya. Finally, the aspect of tomb construction of Gimhae area was also studied. At the second bifurcation from the Former Gaya to the Later Gaya, tombs of “the inner gulf of Gimhae” were rapidly decreasing. It is connected with a decline in population. The boundaries of a tomb spread to the suburbs, and the Nakdong river area was be fully used than before. It is connected with the collapse of the centre elite group of the Former Gaya.
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