Emperor Antoku was the 81st emperor of Japan, according to the traditional order of succession. His reign spanned the years from 1180 through 1185. His death marked the end of the Heian period and the beginning of the Kamakura period. Born: December 29, 1178 Died: May 2, 1185 In office: March 25, 1180 – May 2, 1185 Wiki link