The Japanese archipelago did not have a country until the 4th century. In ancient Japanese mythology, the Japanese called it "eight continents" and "eight island countries". China called Japan "Japan" or "Japan" in ancient times. In the 5th century A.D., after Japan's reunification, the title was Yamato. In the second half of the 7th century, Japan sent Tang Shi to change the country name to Japan, which became the official name of Japan. "Fusang" and "Japan" are also nicknames of Japanese country names.