Asked to name a German city associated with the Lutheran Reformation, most people with any knowledge of the period would, I suppose, cite Wittenberg — the Saxon university town from which that Reformation was launched. But an equally serious candidate would be Augsburg in what is now northern Bavaria where the single most authoritative document of Lutheranism, the Confessio Augustana or ‘Augsburg Confession’ was promulgated in 1530. It was to Augsburg, where the Reichstag, the imperial Diet, was meeting, that the former Master of the Dominicans, Thomist theologian and Catholic church reformer, Thomas de Vio was sent in 1518 as papal legate with a mandate to bring Dr Luther, member of the Order of Augustinian Hermits and professor of biblical studies, to his senses. De Vio — better known from his birthplace, Gaeta in the kingdom of Naples, as il Gaetano or Cajetan, was at first viewed by Luther with comparative favour. Although Luther shared the anti-Italian feelings common in Germany in this period, disliked what he knew of Thomism, and numbered several Dominicans among his harshest critics, he found Cardinal Cajetan learned and humane. There was, however, no real meeting of minds. So far as Luther was concerned, the encounter was to be a debate, like the Heidelberg Disputation from which he had just emerged with flying colours.