Lucius Mestrius Plutarchus (46-120 AD) was a Greek historian, biographer, essayist, and Middle Platonist known primarily for his Parallel Lives and Moralia. In addition to his duties as a priest of the Delphic temple, Plutarch was also a magistrate in Chaeronea and he represented his home on various missions to foreign countries during his early adult years. Plutarch held the office of archon in his native municipality, probably only an annual one which he likely served more than once. He busied himself with all the little matters of the town and undertook the humblest of duties. Plutarch's best-known work is the Parallel Lives, a series of biographies of famous Greeks and Romans, arranged in pairs to illuminate their common moral virtues and vices. The surviving Lives contain 23 pairs, each with one Greek Life and one Roman Life, as well as four unpaired single Lives. By his writings and lectures Plutarch became a celebrity in the Roman empire, yet he continued to reside where he was born, and actively participated in local affairs, even serving as mayor. At his country estate, guests from all over the empire congregated for serious conversation, presided over by Plutarch in his marble chair. Many of these dialogues were recorded and published, and the 78 essays and other works which have survived are now known collectively as the Moralia.