"As a mere constellation of talent in different fields Anselm, Gregory VII and William the Conqueror were the greatest men in Europe during this period... William and Gregory were men of action of a kind rare at any time, but almost unknown in the Middle Ages: they were creators who dealt intuitively with confused situations, having little in precedent or business routine or learned construction to guide them. Gregory had an energy of purpose and clarity of vision in practical affairs for which no parallel can be found in these centuries. William had an undaunted mastery of the problems of the secular world—that is to say, of other men's wills—in both fighting and ruling, unapproached in creative power by any other medieval ruler after Charlemagne."