Editing Kofun period (section)

==={{anchor|Territorial expansion of Yamato}}Territorial expansion===
[[File:Warehouse (Kofun era) Osaka JPN 001.jpg|thumb|alt=Brown building with an angular roof|Reconstructed Kofun-era warehouse]]
In addition to archaeological findings indicating a local monarchy in [[Kibi Province]] as an important rival, the legend of the 4th-century Prince [[Yamato Takeru]] alludes to the borders of the [[Yamato Province|Yamato]] and battlegrounds in the region; a frontier was near the later [[Izumo Province]] (eastern present-day [[Shimane Prefecture]]). Another frontier, in [[Kyūshū]], was apparently north of present-day [[Kumamoto Prefecture]]. According to the legend, there was an eastern land in [[Honshu|Honshū]] "whose people disobeyed the imperial court" and against whom [[Yamato Takeru]] was sent to fight.{{citation needed|date=September 2018}} It is unclear if the rival country was near the Yamato nucleus or further away. [[Kai Province]] is mentioned as a location where prince Yamato Takeru traveled on his military expedition.

The period's northern frontier was explained in ''[[Kojiki]]'' as the legend of [[Shido shogun|Shido Shōgun's]] (四道将軍, "Shōguns to four ways") expedition. One of four ''[[shōgun]]s'', Ōbiko set out northward to Koshi and his son Take Nunakawawake left for the eastern states. The father moved east from northern Koshi, and the son moved north;{{contradictory inline|date=September 2018|reason=See previous sentence.}} they met at Aizu, in present-day western [[Fukushima Prefecture]]. Although the legend is probably not factual, Aizu is near southern Tōhoku (the northern extent of late-4th-century keyhole-kofun culture).