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By the Zhou dynasty, inscriptions from bronze vessels and the Book of Rites suggest that the Zhou kings founded schools for young aristocratic men to serve the king. The Book of Rites suggests that most of these schools were located near ponds and forests, and therefore historians infer that these schools mostly focused on martial arts education, especially archery. From the Zhou period onwards, the imperial government would have a strong influence on the education system. The traditions from this period were passed on through the Book of Rites, which later became one of the Five Classics of the Confucian Canon. During the late Autumn and Spring period, such schools had become commonplace throughout the Zhou dynasty, but the power of the central government was slowly giving way to local warlords.