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Nicolaus Cusanus, also known as Nicholas of Cusa, was a prominent German theologian, philosopher, astronomer, and mathematician of the 15th century. He is renowned for his significant contributions to various fields of knowledge, including philosophy, theology, astronomy, and mathematics. Cusanus's ideas, such as the concept of "docta ignorantia" ("learned ignorance") and the heliocentric theory of the universe, had a profound impact on intellectual thought during the Renaissance and beyond.