It would be at the end of the fifth century that advanced clustered tumuli mounds appeared in one section of the Kinai region, and house shaped stone coffins were introduced inside these large Kofun mounds.
5世紀の終わりには、畿内の一部に先進的な群集墳が現れ、大型古墳に家型石棺が取り入れられるようになった。