On October 16, 1946, Joachim von Ribbentrop, former Foreign Minister of the Third Reich, was hanged after being sentenced to death by the Nuremberg Tribunal on charges of ‘preparing a war of aggression’. Rudolf von Ribbentrop, his son, provides new insights into the general historiography. Born in 1921, he found himself placed by his parents in the secrets of politics and diplomacy, at the age of 12. From a prime witness, we present a new biography of his father and aspects unknown – and sourced – of German foreign policy; an exceptional witness to history. It is also the testimony from an officer on the Eastern Front and Normandy until his last interview with Hitler in 1945, reduced to a total decline.Thirdly, it is a testimony that belies the springs of Hitlerism, as no one has done before. It is an exceptional book on these three aspects. An event in terms of historical literature.