Following the establishment of the Yamato sovereignty, tomb mounds (large keyhole-shaped tomb mound), which were greater in scale than any previously constructed tomb mounds, appeared in Japan and were concentrated in the Nara Basin.
ヤマト王権の成立期には、従前のものより格段に大規模な墓（前方後円墳）が奈良盆地を中心に登場している。