354 – 430
Augustine of Hippo (354–430) was a North African bishop, philosopher, and theologian whose synthesis of Neoplatonism and Christian doctrine shaped the entire trajectory of Western theology and medieval philosophy. His explorations of memory, time, will, and divine illumination established foundational categories that persisted through Scholasticism and into modernity. As the preeminent Doctor of Grace, he defined orthodox positions on original sin, predestination, and the nature of God that remain authoritative in Catholic and Protestant traditions alike.
Synthesized Neoplatonic metaphysics with Christian theology, establishing a framework dominant for over a millennium
Developed the Western doctrine of original sin and the theology of divine grace against Pelagianism
Wrote Confessions, pioneering the introspective autobiographical genre and the philosophy of memory and time
Authored City of God, a foundational work in political theology distinguishing the earthly and heavenly cities
Formulated the doctrine of divine illumination as the basis for human knowledge of eternal truths