Her name was Pimiko.During the reigns of Huandi [147–168] and Lingdi [168–189] the country of Wa was in a state of great confusion, war and conflict raging on all sides.
Thereupon they placed her on the throne.In the reign of Huandi and Lingdi that country that was in great disorder, whose inhabitants had gradually gone to war against each other; so that, over the years, it came to be without a ruler.
However archaeological findings of stone or metal weapons and of defensive villages, particularly from the eastern Inland Sea to Kinki support the occurrence of battles during the Yayoi period.
The Yayoi period is characterised by the introduction of rice cultivation and metallurgy from China or Korea, the development towards an agrarian society and the establishment of a social class structure.
[11] In the mid Yayoi period, community leaders managed to extend their authority over small regions the size of present-day districts; thanks partially to the control of imports and technology.
A smoldering political situation around the mid 2nd century or a power struggle between the Wa kingdoms have been named as possible origins.
[nb 4][16][18][19] The rebellion also led to the formation of an early polity under Himiko's rule and as such is considered as a turning point between Yayoi and Kofun period.