japan By sienna.1 Period: 794 to 1187 The Heian Period Period: 1180 to 1188 The Genpei War The Genpei War was a civil war between the Taira and Minamoto clans. Period: 1183 to 1333 The Kamakura Period Period: 1335 to 1537 Muromachi Period Period: 1574 to 1600 Azuchi-Momoyama Period