Pelagian

To a large degree, "Pelagianism" was defined by its opponent Augustine, and exact definitions remain elusive. Although Pelagianism had considerable support in the contemporary Christian world, especially among the Roman elite and monks, it was attacked by Augustine and his supporters, who had opposing views on grace, predestination and free will. Augustine proved victorious in the Pelagian controversy; Pelagianism was decisively condemned at the 418 Council of Carthage and is regarded as heretical by the Roman Catholic Church and Eastern Orthodox Church. For centuries afterward, "Pelagianism" was used in various forms as an accusation of heresy for Christians who hold unorthodox beliefs. However, more recent scholarship in both theology and religious studies has questioned how strongly Pelagius's beliefs differed from those of his opponents and from modern mainstream Christians.