Osaka is one of the three famous cities in Japan, and the Osaka Castle is very well known. It was built in 1583 by the famous Toyotomi Hideyoshi, who is well known in Japanese history. Toyotomi Hideyoshi had a fight with Tokugawa Ieyasu as he did not recognize him as a capable general. He felt that capable people were more ambitious. Toyotomi Hideyoshi was able to suppress Tokugawa Ieyasu when he was alive. After the death of Toyotomi Hideyoshi, the conflict between the Tokugawa clan and the Toyotomi clan intensified.  Later, Tokugawa Ieyasu launched two campaigns in summer and winter. He defeated the Toyotomi clan, and destroyed Osaka Castle. In 1620, however, the second generation general of Tokugawa Shogun, Tokugawa Hideto, rebuilt the "surrounded city". The core building of Osaka Castle is the castle tower in the centre of the city. It looks like five floors, but there are actually eight floors. The top floor of the castle tower overlooks the bustling city of Osaka. From its appearance, the architectural style of the castle tower and the main building of Kumamoto Castle and Nagoya City are printed like a mould. The Tengwang Pavilion in Nanchang, Jiangxi is also very similar, once again confirming the historical statement that Japanese culture originated from Chinese culture.