At the end of the third century, one of the Yayoi period's burial systems was called the funkyubo (grave mound or tumulus) [tombs of Shucho (head of an organization, chief)]; these tumulus appeared all over western Japan, and those funkyubo would have contained unique tsubogata doki (jar-shaped pottery vessels, unglazed earthenware) and kidaigata doki (stand-shaped pottery vessels, unglazed earthenware) inside.
3世紀の後半には、西日本各地に特殊な壺形土器、器台形土器を伴った弥生時代の墓制墳丘墓（首長墓）が現れる。