Justin, known posthumously as Justin Martyr (; 90–100 AD165 AD), also known as Justin the Philosopher, was an early Christian apologist and philosopher.
Most of his works are lost, but two apologies and a dialogue did survive. The First Apology, his most well-known text, passionately defends the morality of the Christian life, and provides various ethical and philosophical arguments to convince the Roman emperor Antoninus Pius to abandon the persecution of the Church. Further, he also indicates, as St. Augustine would later, regarding the "true religion" that revealed itself as Christianity, that the "seeds of Christianity" (manifestations of the Logos acting in history) actually predated Christ's incarnation. This notion allows him to claim many historical Greek philosophers (including Socrates and Plato), in whose works he was well studied, as unknowing Christians.
Justin was martyred, along with some of his students, during the reign of Marcus Aurelius around the year 165, and is venerated as a saint by the Catholic Church, the Oriental Orthodox Churches, Lutheran Churches, and in Anglicanism.
Life
thumb|right|A bearded Justin Martyr presenting an open book to a Roman emperor. Engraving by [[Jacques Callot.]]
Justin Martyr was born , into a Greek family, at Flavia Neapolis (today Nablus) near the ancient biblical city of Shechem, in Samaria. He knew little or no Hebrew and Aramaic, and had only a passing acquaintance with Judaism. His grandfather, Bacchius, had a Greek name, while his father, Priscus, bore a Latin name, which has led to speculations that his ancestors may have settled in Neapolis soon after its establishment or that they were descended from a Roman "diplomatic" community that had been sent there.
In the opening of the Dialogue, Justin describes his early education, stating that his initial studies left him unsatisfied due to their failure to provide a belief system that would afford theological and metaphysical inspiration to their young pupil. He says he tried first the school of a Stoic philosopher, who was unable to explain God's being to him. He then attended a Peripatetic philosopher but was put off because the philosopher was too eager for his fee. Then he went to hear a Pythagorean philosopher who demanded that he first learn music, astronomy, and geometry, which he did not wish to do. Subsequently, he adopted Platonism after encountering a Platonist thinker who had recently settled in his city. in the vicinity of the seashore, who engaged him in a dialogue about God and spoke of the testimony of the prophets as being more reliable than the reasoning of philosophers.