Empresses of Japan in the 8th & 9th centuries By AgentGYM Period: 707 to 715 Empress Genmei: 707 - 715 Period: 715 to 724 Empress Genshō: 715 - 724 Period: 749 to 758 Empress Kōken: 749 - 758 Period: 764 to 770 Empress Shōtoku (Also Empress Kōken): 764 - 770