The Parallel Lives (Ancient Greek: Βίοι Παράλληλοι, Bíoi Parállēloi; Latin: Vītae Parallēlae) is a series of 48 biographies of famous men written by the Greco-Roman philosopher, historian, and Apollonian priest Plutarch, probably at the beginning of the second century. The lives are arranged in pairs to illuminate their common moral virtues or failings.[1] The surviving Parallel Lives comprises 23 pairs of biographies, each pair consisting of one Greek and one Roman of similar destiny, such as Alexander the Great and Julius Caesar, or Demosthenes and Cicero. It is a work of considerable importance, not only as a source of information about the individuals described, but also about the times in which they lived.