Optatus was a fourth-century bishop of Milevis in Numidia who became a significant voice in early Christian theology. Living during a period of intense ecclesiastical division, he is primarily recognized for his written defenses against the Donatist movement. His work sought to uphold the necessity of universal church unity and the spiritual validity of the sacraments, regardless of the moral standing of the individual minister. As a scholar and priest, his writings provided a foundational argument for the continuity of the Church.