Richard Freiherr von Krafft-Ebing (1840–1902; full name Richard Fridolin Joseph Freiherr Krafft von Festenberg auf Frohnberg, genannt von Ebing) was an Austro-German psychiatrist and author of the foundational work Psychopathia Sexualis (1886), a Clinical-Forensic Study, which was first published in 1886 and expanded in subsequent editions. The last edition from the hand of the author (the twelfth) contained a total of 238 case histories of human sexual behaviour. Translations of various editions of this book introduced to English such terms as "sadist" (derived from the brutal sexual practices depicted in the novels of the Marquis de Sade), "masochist", (derived from the name of Leopold von Sacher-Masoch), "homosexuality", "bisexuality", "necrophilia", and "anilingus". Psychopathia Sexualis is a forensic reference book for psychiatrists, physicians, and judges. Written in an academic style, its introduction noted that, to discourage lay readers, the author had deliberately chosen a scientific term for the title of the book and that he had written parts of it in Latin for the same purpose. Psychopathia Sexualis was one of the first books about sexual practices that studied homosexuality/bisexuality. It proposed consideration of the mental state of sex criminals in legal judgements of their crimes. During its time, it became the leading medico–legal textual authority on sexual pathology.
