Anicia Faltonia Proba (died  AD 432) was a Christian Roman noblewoman. She had the distinction of knowing both St. Augustine, who was the greatest theologian of the first millennium of Christian history, as well as John Chrysostom, who was its greatest preacher. We have two letters of Augustine to Proba, and the first (Letter 130) is the only single, substantial treatment on the subject of prayer that St. Augustine ever wrote.