Justin Martyr
Approx. 100 AD — Approx. 165 AD
Justin Martyr was a pagan philosopher from Samaria who found in Christianity the only philosophy that could not be refuted — and spent the rest of his life arguing it before the Roman Empire. He wrote the first great defenses of Christian doctrine addressed directly to the emperor, then died by beheading in 165 AD when a rival philosopher denounced him to the prefect Junius Rusticus.