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Confucianism is a system of philosophical and ethical teachings founded by Confucius and developed by Mencius.
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There was little separation of church and state in the middle ages. Besides being royal or having a title, some of the highest ranks in society you could achieve were within The Church.
Additionally, performing certain rites and receiving different ordinances were some of the key ways monarchs could keep up appearances and have a positive reputation with their citizens and peers.
D. Religion, this dynasty became very famous for their advances in field of science, religion, philosophy, technology, art, astronomy, engineering etc.