Plutarch (/ˈpluːtɑːrk/; Greek: Πλούταρχος, Ploútarchos; Koine Greek: [ˈplutarkʰos]; AD 46–after AD 119) was a Greek Middle Platonist philosopher, historian, biographer, essayist, and priest at the Temple of Apollo. He is known primarily for his Parallel Lives, a series of biographies of illustrious Greeks and Romans, and Moralia, a collection of essays and speeches. Upon becoming a Roman citizen, he was named Lucius Mestrius Plutarchus (Λούκιος Μέστριος Πλούταρχος).