ancient battle    ancient history    ancient japan    conquest and exploration    decisive battles    foreign forces    full documentary    genghis khan    history lesson    history of japan    isolated from the west    japan - memoirs of a secret empire    japan dynasty    japan history    japan history documentary    japan warlords    mongol empire    mongol history    mongolian empire    mongolian history    renaissance    return of the barbarians    samurai    secret world    tokugawa    world history