This millennium witnessed profound transformations in every aspect of Japanese civilization: the flowering of court culture in Heian-kyō, the rise of the warrior class and the establishment of the shogunate, the traumatic Mongol invasions, the centuries of civil war known as the Sengoku period, the unification under Oda Nobunaga and Toyotomi Hideyoshi, the long peace of Tokugawa rule, and finally the tumultuous collapse of the shogunate and the restoration of imperial authori