Traditionally, the region of Southern Kyushu was the stronghold of the three clans of Taniyama, Taira of Satsuma and Kimotsuki, who were Zaichokanjin (the local officials in Heian and Kamakura periods), but the advancement of the Togoku Samurais such as the Shimazu clan and the Shibuya clan into the region during the Kamakura Period created friction between them.
従来、南九州は谷山氏ら薩摩平氏や肝付氏など在庁官人が勢力をもっていた地であったが、鎌倉時代、島津氏や渋谷氏と言った東国武士団が進駐し、在地勢力との間に軋轢を生んでいた。