Emperor Keikō
The first mention in Japanese of the word "Emishi" is in the "Nihon Shoki" of 720, where the word appears in the phonetic spelling . This is in the record of Emperor Jimmu, stating that his armed forces defeated a group of Emishi before Jimmu was enthroned as the Emperor of Japan. According to the , Takenouchi no Sukune in the era of Emperor Keikō proposed the subjugation the Emishi of in eastern Japan.