From the death of Henry the Fowler, in 936, down to the nomination of Frederick I of Bavaria, sixth Burgrave of Nuremberg, to be Margrave of Brandenburg, in 1411, the history of the particular Germany we are studying is swallowed up in the history of these German tribes of central Europe and of the Holy Roman Empire. It is in these years of the seven Crusades, from 1095 to the last in 1248; of Frederick Barbarossa; of the centuries-long quarrel between the Welfs, or Guelphs, and the Waiblingers, or Ghibellines, which were for years in Italy, and are still in Germany, political parties; of the Hanseatic League of the cities to protect commerce from the piracies of a disordered and unruled country; of the Dane and the Norman descents upon the coasts of France, Germany, and England, and of their burning, killing, and carrying into captivity; of the Saracens scouring the Mediterranean coasts and sacking Rome itself; of the Wends and Czechs, Hungarian bands who dashed in upon the eastern frontiers of the now helpless and amorphous empire of Charlemagne, all the way from the Baltic to the Danube; of the quarrel between Henry IV and that Jupiter Ecclesiasticus, Hildebrand, or Gregory VII, who has left us his biography in the single phrase, "To go to Canossa"; of Genghis Khan and his Mongol hordes; of the long fight between popes and emperors over the right of investiture; of Rudolph of Hapsburg; of the throwing off of their allegiance to the Empire of the Kings of Burgundy, Poland, Hungary, and Denmark; of the settlement of the question of the legal right to elect the emperor by Charles IV, who fixed the power in the persons of seven rulers: the King of Bohemia, the Count Palatine of the Rhine, the Duke of Saxony, the Margraf of Brandenburg, and the three Archbishops of Mayence, Treves, and Cologne; of the independence of the great cities of northern Italy; of Otto the Great, whose first wife was a granddaughter of Alfred the Great, and who was the real founder of the Holy Roman Empire, in the sense that a German prince rules over both Germany and Italy with the approval of the Pope, and in the sense that he, a duke of Saxony, appropriates the western empire (962), goes to Rome, delivers the Pope, subdues Italy, and fixes the imperial crown in the name and nation of Germany; of the beginning of that hope of a world-church and a world-state, of a universal church and a universal kingdom, which took form in what is known as the Holy Roman Empire; of that greatest of all forgeries, the Donation of Constantine by the monk Isidor, discovered and revealed by Cardinal Nicolaus, of Cura, in which it is pretended that Constantine handed over Rome to the Pope and his successors forever, with all the power and privileges of the Caesars, and of the effects of this, the most successful lie ever told in the world, during the seven hundred years it was believed: it is in these years of turbulence and change