means a 5th-century british theologian who denied original sin and taught that humans can achieve moral perfection through free will alone, without needing divine grace.

from born around 354 ce, probably in britain, his name is the greek word for sea rendered latin, likely a translation of a celtic name; he moved to rome, gathered followers appalled by augustine's doctrine of inherited sin, and got declared a heretic at the council of carthage in 418 for suggesting people could actually behave themselves.