- Ghenghiz Cohen, known as Cohen the Barbarian, is a hero in the classical sense, i.e., a professional thief, brawler and ravisher of women. Cohen is introduced in the second Discworld novel, The Light Fantastic, with significant returns in Interesting Times and then with his last appearance in The Last Hero. His name and character are an obvious echo of Robert E. Howard’s Conan the Barbarian and Genghis Khan, and of the common Jewish surname Cohen.