Saint Augustine of Hippo was a Christian theologian, philosopher and bishop, born on November 13, 354 AD, in Thagaste, a small town in what is now Algeria. He is widely regarded as one of the most influential thinkers in the history of Christianity. Augustine was educated in North Africa and Rome, and for a time he followed a career as a teacher of rhetoric. He was deeply influenced by the works of Plato, and later by the teachings of Saint Ambrose, bishop of Milan. He converted to Christianity in 386 AD, and was baptized by Ambrose the following year. In the years that followed, Augustine became a leading figure in the Christian church, serving as bishop of Hippo Regius, a city in what is now Algeria. He wrote extensively on a wide range of topics, including theology, philosophy, ethics, politics and history. His most famous works include ""The Confessions,"" ""The City of God,"" and ""On Christian Doctrine."" Augustine's theological teachings had a profound impact on the development of Christianity, particularly in the areas of grace, original sin, and predestination. He also contributed to the development of Christian philosophy, including the concept of the just war. Augustine died on August 28, 430 AD, during the siege of Hippo Regius by the Vandals. He is venerated as a saint by the Catholic Church and the Eastern Orthodox Church, and his writings continue to be studied and admired by scholars and laypeople alike.