It is not known when humans first settled on the Japanese archipelago. It was long believed that there was no Paleolithic occupation in Japan, but since World War II thousands of sites have been unearthed throughout the country, yielding a wide variety of Paleolithic tools.
Britannica, 2015
Japan was unified by the Yamato court C.250-552. Japan was then subject to various influences, including Buddhism and Confucianism and developed into a class-based feudal society.