Who wrote the City of God and greatly influenced the early development of Christian theology?

• A. Justin Martyr
• B. Origen
• C. Thomas Aquinas
• D. Augustine

Answer: (D)

Augustine of Hippo authored the City of God, written in the early 5th century to address concerns that Christianity was to blame for Rome’s fall and to lay out how a Christian understanding should interpret history and society. In it he contrasts the City of God with the earthly city, arguing that true peace comes from God’s grace and that the Church guides believers through history while remaining distinct from worldly power. This work helped shape foundational Christian doctrines—such as original sin, grace, salvation, and the relationship between church and state—and thus had a lasting influence on late antique and medieval theology. The other figures were important early Christian writers or later theologians, but they did not write this work: Justin Martyr and Origen contributed to early Christian thought, while Thomas Aquinas produced a later, separate body of work.