Justin Martyr was an early Christian apologist, philosopher, and theologian who lived in the 2nd century AD. He was born in Flavia Neapolis (modern-day Nablus, Palestine) around 100 AD. Justin was a pagan until his conversion to Christianity in approximately 130 AD.
After his conversion, Justin became a Christian apologist, defending the Christian faith against paganism and other religions. He wrote several works, including the Apology to the Emperor Antoninus Pius, the Apology to the Senate and People of Rome, and the Dialogue with Trypho. In these works, Justin argued for the truth of Christianity and the superiority of the Christian faith over other religions. He also defended Christians against the charges of atheism and immorality.
Justin Martyr was martyred in Rome in 165 AD during the reign of Emperor Marcus Aurelius. He is considered a saint by the Catholic Church and the Eastern Orthodox Church.