It is genuinely striking that a religion whose central symbol is an execution has never dogmatically defined what the execution accomplished. The early Greek fathers spoke of a ransom, sometimes with a startling image of God baiting the devil. Anselm, around 1098, recast it as satisfaction owed to God's violated honour, in the terms of a feudal society that understood exactly what that meant. The Reformers turned satisfaction into penal substitution: the sentence falls, and Christ takes it. Abelard emphasised the demonstration of love that changes the observer. Gustaf Aulen in 1931 revived the ancient reading as Christus Victor, the defeat of the powers. Several of these coexist happily inside a single hymnbook. The live argument now is largely evangelical and internal, with a growing number of theologians in Africa, Britain and North America arguing that penal substitution as usually preached makes the Father into the problem and the Son into the solution, which is a Trinitarian error whatever else it is.