薩摩国
In 1306, Chikama Tokiie, a deputy "jitō" of Kawanabe District, Satsuma Province on behalf of the Hōjō clan, the de facto ruler of the Kamakura shogunate, created a set of documents that specified properties to be inherited by his family members, which included Kikaijima, together with other islands of the Ōsumi, Tokara and Amami Islands. After the fall of the Kamakura shogunate, the southern islands seem to have been transferred to the Shimazu clan. It claimed the "jito" of the Twelve Islands, which were limited to the Ōsumi and Tokara Islands. However, when Shimazu Sadahisa, the head of the clan, handed over Satsuma Province to his son Morohisa in 1363, he added the extra Five Islands as the territories to be succeeded, which seem to refer to the Amami Islands including Kikaijima.