Paracelsus (born Phillippus Aureolus Theophrastus Bombastus von Hohenheim, 1493-1541) was a Renaissance physician, botanist, alchemist, astrologer, and general occultist. "Paracelsus", meaning "equal to or greater than Celsus", refers to the Roman encyclopedist Aulus Cornelius Celsus from the first century known for his tract on medicine. He is also credited for giving zinc its name, calling it zincum, and is regarded as the first systematic botanist.