The Kofun period (古墳時代, Kofun jidai) is an era in the history of Japan from about 258/300 to 538/710 AD (the date of the introduction of Buddhism), following the Yayoi period. The Kofun and the subsequent Asuka periods are sometimes collectively called the Yamato period. This period is the earliest era of recorded history in Japan, but studies depend heavily on archaeology since the chronology of historical sources tends to be distorted. Kofun is Japanese for the type of burial mound dating from this era.
It was a period of cultural import. Continuing from the Yayoi period, the Kofun period is characterized by influence from China and the Korean peninsula; archaeologists consider it a shared culture across the southern Korean peninsula, Kyushu and Honshu. On the other hand, the most prosperous keyhole-shaped burial mounds in Japan during this period were approximately 5,000 in Japan from the middle of the 3rd century in the Yayoi period to the 7th century in the Asuka period, and many of them had huge tombs, but in the southern Korean peninsula there were only 13 from the 5th century to the 6th century, and the tombs were small. Wall decorations and Japanese-style armor, which are characteristic of older Japanese burial mounds, were excavated from 5th century burial mounds in the southern Korean peninsula. This shows that Japan and the southern Korean peninsula influenced each other.
