397 A.D. Preaches at Carthage during the summer and participates in the councils of Carthage.
411 A.D. Participates in Collatio of 411, a conference set to resolve the intense conflicts between the Donatists and the Catholics. Augustine had long been against the Donatists, who considered sacraments performed by priests who betrayed the Church during the times of Roman persecution null or invalid. Augustine opposed the movement, believing sacraments were instituted by Christ, not man. This conference resolved in favor of the Catholics.
412 A.D. Augustine begins writing City of God.
413 A.D. The first chapters of City of God are published.
426 A.D. Augustine leaves Hippo in the winter for his health; begins Retractationes.