Adrienne Mayor’s The Poison King is a fascinating biography of Mithradates Eupator Dionysus, one of the most controversial monarchs of ancient history who has been especially neglected by scholars of Iranian history. This biography, like any other about ancient heroes, is full of tales, legends, stories, and historical narratives and its crafty author knows how to distinguish between fact and fiction. The book contains 15 chapters, in which, other than the first, the remaining chapters are arranged based on Mithradates’ life, from his birth to his death.