Pelagius (ca. 354 – ca. 420/440) was an ascetic monk an reformer who denied the doctrine of original sin, later developed by Augustine of Hippo, inherited from Adam and was declared a heretic by the Roman Catholic Church. His interpretation of a doctrine of free will became known as Pelagianism. He was well educated, fluent in both Greek and Latin, and learned in theology. He spent time as an ascetic, focusing on practical asceticism, which his teachings clearly reflect. He was not, however, a cleric. He was certainly well known in Rome, both for the harsh asceticism of his public life as well as the power and persuasiveness of his speech. His reputation in Rome earned him praise early in his career even from such pillars of the Church as Augustine, who referred to him as a "saintly man." However, he was later accused of lying about his own teachings in order to avoid public condemnation. Most of his later life was spent defending himself against other theologians and the Catholic Church.