Baron d'Holbach was a prominent French philosopher during the Enlightenment period. This intellectual was known for his radical beliefs in atheism, determinism, and the rejection of free will. Some of the synonyms that can be used to describe the Baron include skeptic, materialist, freethinker, and philosopher. He was also known for his contributions to the fields of science and literature, and was a prolific writer on various subjects. The Baron's works were highly controversial and criticized by many during his time, however his ideas have continued to influence modern thought and philosophy.