Gatlin is an immortal who appears only in the audio book, The Lesson. He became a chronic nemesis for Duncan MacLeod: “I first met Pieter Gatlin in 1868. It was a beautiful, warm sunny afternoon when he first tried to kill me.” Every ten years, Gatlin searches Duncan out - and every ten years, Duncan is defeated... but not beheaded. Pieter Gatlin, who seems to be offering the lesson of the title duel in Restoration Spain, at a staging post on the Zambezi River, 10 years later, and every decade after that, until the dispute is concluded in a Parisian car showroom.