Ōsumi Province
The Tanegashima clan established firm control over Yakushima, which was known for forestry. In 1524 Tanegashima Tadatoki built two fortresses on Yakushima. In 1543, Tadatoki's son Shigetoki was attacked by Nejime Shigetake, a ruler of Ōsumi Province, and fled to Tanegashima. Shigetoki handed over Yakushima to Nejime but restored it by force the following near. Tanegashima continued to battle against Nejime until 1572.