It is in the fourteenth century that we may view in the strongest light the state and contrast of the Roman empire of Germany, which no longer held, except on the borders of the Rhine and Danube, a single province of Trajan or Constantine. Their unworthy successors were the counts of Hapsburgh, of Nassau, of Luxemburgh, and Schwartzenburgh: the emperor Henry the Seventh procured for his son the crown of Bohemia, and his grandson Charles the Fourth was born among a people strange and barbarous in the estimation of the Germans themselves. 150 After the excommunication of Lewis of Bavaria, he received the gift or promise of the vacant empire from the Roman pontiffs, who, in the exile and captivity of Avignon, affected the dominion of the earth. The death of his competitors united the electoral college, and Charles was unanimously saluted king of the Romans, and future emperor; a title which, in the same age, was prostituted to the Caesars of Germany and Greece. The German emperor was no more than the elective and impotent magistrate of an aristocracy of princes, who had not left him a village that he might call his own. His best prerogative was the right of presiding and proposing in the national senate, which was convened at his summons; and his native kingdom of Bohemia, less opulent than the adjacent city of Nuremberg, was the firmest seat of his power and the richest source of his revenue. The army with which he passed the Alps consisted of three hundred horse. In the cathedral of St. Ambrose, Charles was crowned with the iron crown, which tradition ascribed to the Lombard monarchy; but he was admitted only with a peaceful train; the gates of the city were shut upon him; and the king of Italy was held a captive by the arms of the Visconti, whom he confirmed in the sovereignty of Milan. In the Vatican he was again crowned with the golden crown of the empire; but, in obedience to a secret treaty, the Roman emperor immediately withdrew, without reposing a single night within the walls of Rome. The eloquent Petrarch, 151 whose fancy revived the visionary glories of the Capitol, deplores and upbraids the ignominious flight of the Bohemian; and even his contemporaries could observe, that the sole exercise of his authority was in the lucrative sale of privileges and titles. The gold of Italy secured the election of his son; but such was the shameful poverty of the Roman emperor, that his person was arrested by a butcher in the streets of Worms, and was detained in the public inn, as a pledge or hostage for the payment of his expenses.