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In page Kofun period:

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In addition to archaeological findings indicating the Kingdom of Kibi as a significant rival, the legend of the 4th-century culture hero Yamato Takeru alludes to the borders of the Yamato and battlegrounds in the region; a frontier was near the later Izumo Province (eastern present-day Shimane Prefecture). The frontier in Kyushu was apparently located north of present-day Kumamoto Prefecture. According to the legend, there was an eastern land in Honshu "whose people disobeyed the imperial court" and against whom Yamato Takeru was sent to fight.[citation needed] It is unclear if the rival country was near the Yamato nucleus or further away. Kai Province is mentioned as a location where Yamato Takeru travelled on his military expedition.