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Proclus was a Greek philosopher of the Neoplatonic school of thought, which combined elements of Plato's philosophy with the ideas of later philosophers such as Plotinus. Proclus was a prolific writer, and his work covered a wide range of topics, including metaphysics, ethics, and logic. He was also a significant figure in the development of theurgy, a form of ritual magic that was based on Neoplatonic philosophy.