When and where did Pilegius oppose St Augustine obout original sin?

Pelagius opposed St. Augustine on the issue of original sin in the early 5th century, primarily in Rome and North Africa. Their debate centered around the nature of sin, free will, and the role of grace in salvation. Pelagius argued that humans have the ability to choose good or evil without the need for divine intervention, while Augustine believed that original sin had corrupted human nature and that salvation could only come through God's grace. The controversy ultimately led to Pelagius being condemned as a heretic by the Church.