Lucilio Vanini, who, in his works, styled himself Giulio Cesare Vanini, was an Italian philosopher, physician and free-thinker, who was one of the first significant representatives of intellectual libertinism. He was among the first modern thinkers who viewed the universe as an entity governed by natural laws. He was also an early literate proponent of biological evolution, maintaining that humans and other apes have common ancestors. He was executed in Toulouse.