De Jesu Christo Servatore (Of Jesus Christ the Saviour)1 have been central in discussion of it ever since. What the Reformers did was to redefine satisfactio (satisfaction), the main mediaeval category for thought about the cross. Anselm’s Cur Deus Homo?, which largely determined the mediaeval development, saw Christ’s satisfactio for our sins as the offering of compensation or damages for dishonour done, but the Reformers saw it as the undergoing of vicarious punishment (poena) to meet the claims