During the Azuchi–Momoyama period (1568–1600) Japan underwent a process of unification after a long period of civil war. It was marked by the rule of Oda Nobunaga and Toyotomi Hideyoshi, men who built castles as symbols of their power; Nobunaga in Azuchi, the seat of his government, and Hideyoshi in Momoyama. The Ōnin War during the Muromachi period had led to rise of castle architecture in Japan. By the time of the Azuchi-Momoyama period each domain was allowed to have one castle of its own. Typically it consisted of a central tower or surrounded by gardens and fortified buildings. All of this was set within massive stone walls and surrounded by deep moats. The dark interiors of castles were often decorated by artists, the spaces were separated up using sliding "fusuma" panels and "byōbu" folding screens.