Why is St. Augustine recognized as a doctor of the church in Roman Catholicism?

In Roman Catholicism, St. Augustine is recognized as a doctor of the church because he is a saint whose doctrinal writings and teachings are considered to have special authority and exceptional importance to theology.12

As one of the Latin Fathers of the Christian church, Augustine’s work had a profound impact on the development of Western thought. His adaptation of classical Platonic philosophy to Christian teaching created a powerful theological system that shaped the practice of biblical exegesis and laid the foundation for much of medieval and modern Christian tradition. His prolific writings, including Confessions and The City of God, were so widely read and imitated that his synthesis of Christian, Roman, and Platonic ideas defined the terms for centuries of theological debate.1