418 – North African bishops meet to reject Pelagianism.
Pelagianism is the belief that original sin did not taint human nature and that mortal will is still capable of choosing good or evil without special Divine aid. This theological theory is named after the British monk Pelagius (354–420 or 440), although he denied, at least at some point in his life, many of the doctrines associated with his name. Pelagius taught that the human will, as created with its abilities by God, was sufficient to live a sinless life, although he believed that God’s grace assisted every good work. Pelagianism has come to be identified with the view, (whether Pelagius agreed or not), that human beings can earn salvation by their own efforts.
Semi-Pelagianism is a modified form of Pelagianism that was also condemned by the Catholic Church at the Second Council of Orange in 529.