354 – 430
Augustine of Hippo (354–430 CE) was a North African bishop, theologian, and philosopher whose writings profoundly shaped Western Christianity and Western philosophy. His works on grace, free will, original sin, and the Trinity became foundational for both Catholic and Protestant theology, and his Confessions remains one of the most influential autobiographies ever written.
Authored De Trinitate, a systematic exploration of Trinitarian theology including the psychological analogy of the Trinity
Wrote Confessions, pioneering the genre of spiritual autobiography
Developed the doctrine of original sin and the theology of grace in his anti-Pelagian writings
Authored City of God, a foundational work in philosophy of history and political theology
Synthesized Neoplatonic philosophy with Christian doctrine, shaping Western intellectual tradition for centuries