Pelagius

Pelagius arrived in Rome from somewhere in the British Isles, fluent in Latin and living as an ascetic. He taught that humans weren't born damned, that original sin didn't bind them, and that each person bore individual responsibility for choosing righteousness. Augustine of Hippo came down hard, attacking the idea that mankind's nature was good enough to choose salvation unaided. At the Synod of Diospolis in 415, Pelagius faced accusations of heresy. The Church labeled his system Pelagianism and rejected it, but the argument over freedom and grace never quite ended.