The Definitive Study of Christianity's Final Great Defender Against Heresy LEO EUSEBIUS On Heresies presents the first comprehensive analysis of St. John of Damascus's systematic refutation of false teachings that threatened early Christianity. Why Catholic Scholars Need This Book: St. John of Damascus (675-749 AD) stands as Christianity's final great Church Father, defending Catholic tradition before the East-West schism. This study examines his theological warfare against: • Arianism - Denial of Christ's divinity • Manichaeism - Dualistic heresies • Islam - The first systematic Christian response • Nestorianism - Attacks on Christ's unified nature • Pelagianism - Rejection of divine grace • Paulicianism - Proto-Protestant errors Essential For: Seminary students and professors Catholic apologists and theologians RCIA directors and educators Anyone defending orthodox doctrine today In our age of doctrinal confusion, arm yourself with the wisdom of Christianity's greatest heresy-fighter. St. John of Damascus provides the theological weapons needed to defend authentic Catholic teaching. Get your copy now and stand firm against false doctrine.