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Neo-Confucianism was a revived version of old Confucian principles that appeared around the Song dynasty, with Buddhist, Taoist, and Legalist features. The first philosophers, such as Shao Yong, Zhou Dunyi and Chang Zai, were cosmologists and worked on the Yi Jing. The Cheng brothers, Cheng Yi and Cheng Hao, are considered the founders of the two main schools of thought of Neo-Confucianism: the School of Principle the first, the School of Mind the latter. The School of Principle gained supremacy during the Song dynasty with the philosophical system elaborated by Zhu Xi, which became mainstream and officially adopted by the government for the Imperial examinations under the Yuan dynasty. The School of Mind was developed by Lu Jiuyuan, Zhu Xi's main rival, but was soon forgotten. Only during the Ming dynasty was the School of Mind revived by Wang Shouren, whose influence is equal to that of Zhu Xi. This school was particularly important in Japan.