⚠ The Western verdict was the opposite of the Eastern verdict of three years before — and it reversed itself once along the way.
The issue
Was the teaching of Pelagius and Coelestius heresy?
The ruling
Pope Innocent condemned Pelagius's teaching. ⚠ But the matter went back and forth: the next pope, Zosimus, for a time supported Pelagius and Coelestius, and only later changed his mind and condemned them both. The North African church (the Council of Carthage) played a key part in pushing the process along.
Aftermath
⭐ From 415 to 418, within three years, the same teaching was first found innocent, then condemned, and in between was once supported by a pope. ⚠ We do not defend this back-and-forth, nor do we use it to reopen the case — we only ask readers to remember that the process of reaching doctrinal verdicts has never been a straight line; it involves theology, but also church politics and regional differences. After this most of Pelagius's writings were lost; as Olson notes, we know only scraps of them, from what is quoted and reported in the works written to oppose and condemn him — which means that the Pelagius we read today is mainly the Pelagius of his opponents' pens.