The recognition of pregnancy in the Western medical world has been around since the publication of the Hippocratic Corpus, circa mid-fifth century to the mid-fourth century BCE, in the gynecological treatises On the Nature of the Woman, On the Diseases of Women, Generation, On the Nature of the Child, On Sterile Women, On Fistulae, and On Hemorrhoids. The term Caesarean section derives from an ancient Roman, or Caesarean (from Caesar) law that demanded that when a pregnant woman died, her body could not be buried until the unborn child had been removed. Ancient Roman doctors were forbidden from performing this procedure on living women, however.