The success of the policy of Frederic comprehended a union of the hostile elements of his southern territory, the subjugation of the Germanic aristocracy, and of the Italian cities in alliance with the pope. Preparatory to the execution of this policy he made some conquests in Lombardy These successes excited the revenge of the pope, who accordingly visited on his head another excommunication. But the Vatican thunder was allowed to roll on, as amid its music the emperor inarched on from victory to victory. At length, in the development of the policy of Frederic, the time arrived for striking a decisive blow at the heart of the public disorder. By a sudden movement he entered the papal dominions. The pope trembled on his throne. He saw his monarchy at the mercy of an emperor, whom he had anathematized, whose son he had taught to rebel, whose subjects he had corrupted, and whose downfall he had labored to effect. The consummation of the policy of Frederic was in his grasp; but the magnificent prospect which skill and valor had obtained, superstition blasted. Having some reverence for the office, though none for the character of the pope, and conscious of the powerful influence it wielded over the superstitious, he ventured to listen to the papal monarch, who professed a willingness to concede all his demands, but proposed that they should first be sanctioned by a council of the bishops of the church. The emperor soon perceived, but too late, that this specious proposition was but a popish device. The preliminaries for holding the proposed council established the fact, that the pope intended to have it chiefly composed of the most inveterate enemies of the emperor; in fact none but such were invited to participate in its proceedings. Frederic felt justified, therefore, in forbidding the convention to assemble. As his prohibition was disregarded, he intercepted a Genoese fleet of one hundred bishops, and brought them captive to Naples. This manoeuvre broke up the council, and perhaps broke the pope's heart, as he shortly afterwards died.

Cardinal Fiesco, a warm friend of the emperor, became Pope Innocent IV.; but the dignity of pope making him regard the emperor as hostile to his monarchial pretensions; converted his former friendship into bitter annimosity. Returning to Lyons, he confirmed all the anathemas that had been pronounced against Frederic, and summoned him to appear at the bar of a grand council to be convened at that place. In the proceedings of this council the most ridiculous and groundless charges were preferred against Frederic, and though completely refuted by his deputies, yet as the proceedure was merely the semblance of a judicial trial, to sanction preconcerted malice and revenge by forms of legality, the council did not hesitate to declare him guilty, any proof of innocence to the contrary, It seems to have concentrated its ingenuity in devising new and unheard of methods to give terrific importance to the ventilation of its hate. An anathema was pronounced on the body and soul of the emperor, and on all his interests, friends and allies. While pronouncing these religious curses, the priests, like fiends administering at some infernal ceremonies, held in their hands lighted torches, and upon its conclusion suddenly extinguished them; and by the theatrical trick of uttering discordant shrieks and howls, seemed in the darkness of the cathedral to have converted the holy place into the lower regions, peopled with the arch-fiend and his agents. Though these artistical elaborations were not without some effect, yet the vigor of the emperor's genius, the magnanimity which he constantly displayed, his vast popularity, and the triumph of his arms—which continued to his death—demonstrated to the intelligent that there was no real curse in the papal anathemas.

Conrad IV., son of Frederic II., became emperor of Germany in 1250. Innocent IV., whose policy it was to profess any friendship, and violate any obligation that contributed to his interests, determined to complete on the son the vengeance he had commenced on the father. Presumptuous as vindictive he declared that inasmuch as Frederic II. had been excommunicated, his son could not inherit the throne. On the ground of this ridiculous pretext, he pronounced him dispossessed of all his inheritance; laid on him an interdict; and persecuted him by all the means which his power and influence afforded. But notwithstanding a revengeful pope, whose malice through his machinery operated everywhere, yet, he had more than his equal to contend with. The courage and heroism of Conrad defeated the papal army, kept the pope's allies in check, and was about to enter Lombardy with the fairest prospects of success when his illegitimate brother, by administering poison to him, relieved the pope of a formidable adversary.

Conradin, son of Conrad IV., the last of the noble house of Hohenstaufen, was the heir to the throne, The pope refused to acknowledge his right to succession, because his father had been excommunicated. He declared also that Conradin had forfeited his right of inheritance to the crown of Naples and Sicily, and undertook to bestow it on Charles of Anjou. But Conradin entered Italy and defeated the usurper; but while he was pursuing the flying enemy with too much recklessness, he was captured by the vanquished. The world expected that his youth and valor could not but win compassion even from the iron-hearted pope, but the intense hatred of the papal monarch to the noble house of which this intrepid lad was the last scion, would not permit him to allow an opportunity to escape of extinguishing it forever. Conradin was therefore, though but sixteen years old, publicly executed as a criminal; but his heroism, and the circumstances under which he met death, crowned his memory with immortal honor, while it cast a deeper tinge of ignominy on the already blackened character of the pope.

The usurpation of territory, and interference in political affairs, which are so strongly characteristic of the papal policy, originate from the constitutional principles of the Roman See. In conformity with them Pope Boniface VIII. proclaimed himself King of Rome; and declared that the Roman See was the source whence the Germanic electors derived their rights. Albert I. being chosen emperor by the electors in 1298; was summoned by the pope to appear before him and apologize for having accepted the crown without consulting his pleasure, and to expiate the guilt of his offence by the performance of such penance as should be prescribed. To enforce compliance with this injunction the pope formed an allegiance with the archbishop of Mentz, a powerful military bishop, and a former friend of Albert. To resist the belligerent pope Albert effected an alliance with Philip la Belle, of France. Making a sudden diversion into the electorate of Mentz, Albert obliged the bishop to form a league with him for five years. The pope then suggested peaceful negotiation rather than disastrous war. It was finally agreed between the two contracting parties that the pope should give to Albert the possessions of his ally, and that Albert should acknowledge that the western empire was a grant as a fief from the pope, that the electors derived their right from the Roman See, and that he would defend the papal interests with his arms. The pope then proceeded, by virtue of an excommunication, to invalidate the title of Louis la Belle, of France, to his kingdom, and officially to transfer it to Albert I.

During the reign of Henry VII., who became emperor of Germany in 1308, the tyranny and ambition of the pope were held in decent check, and the Papal See was unusually quiet and respectable. The emperor, whom the pope hated, but whom he dared not anathematize, was finally removed by poison administered in the sacramental wine, by Moltipulcian, a Dominican monk. Soon as this event occurred the pope's vengeance, which had been accumulating in fury for years, but which was too much overawed to utter a murmur, now burst forth with the most impetuous and indecent violence in anathemas on the soul, the corpse, the coffin, and the tomb of the dead emperor; but it is not supposed that they done any damage, except to the character and good sense of the Roman See.

Louis IV., of Bavaria, became emperor of Germany in 1330, To arrest the encroachments of the Papal See on the rights of the sovereignty of the empire, the diet of Rense framed a constitution, in 1338, which provided that the choice of the electors of the union should be final in its decision, and independent of the Pope of Rome. These patriotic proceedings seemed to the pope to be interfering with his rights; and John XXI. accordingly prohibited the performance of divine worship in the empire, until the obnoxious constitution should be annulled. But Louis soon repaired this calamity by the creation of Pope Nicholas V., who, having equal authority with Pope John XXI., nullified all his acts. Pope Clement VII., who succeeded to the papal throne in 1342, excommunicated Louis, and by his intrigues caused five electors to declare in favor of Charles of Luxemburg. This violation of the celebrated constitution of 1338 induced three electors to assemble at Lahstein, and declare the choice of Charles null and void; and as Louis had died, they elected Edward of England, but he declining, they elected Frederic the Severe; he also declining, the crown was finally settled on Gunter of Schwarzburg. But Gunter being removed by poison, the papal policy triumphed in the coronation of Charles of Luxemburg.

Charles IV., in 1346, wishing to be crowned by the pope at Rome, visited Italy to negotiate for that favor; Pope Innocent VI., always inclined to make the vanity and ambition of his subjects administer to his aggrandizement, signified a disposition to accommodate the emperor, but on such disgraceful conditions that, by accepting them he subjected himself to the scorn and derision of the world. This self-degradation was much aggravated by the fact that many distinguished Romans, oppressed by the papal administration, united in requesting Charles to claim the city of Rome as a portion of his empire. Instead of improving this opportunity to extend the limits of his government, he renounced all rights, not only to the city of Rome, but to the States of the Church, to Naples, Sicily, Sardinia, and Corsica. He also consented to impose a tax on the empire for the benefit of the Papal See, equal to one-tenth of the ecclesiastical revenues; and further added to his disgrace by taking an oath never to enter Italy without the pope's sanction. For this base sycophancy he was assailed by princes and people with a storm of indignation. To allay the fury of this tempest he announced an intention of convening a council for the reformation of the clergy, and for making liberal concessions to the popular demands. But this attempt to calm the people aroused the indignation of the Papal See. The pope exhorted the electors to depose him instantly. Assailed on all sides, dangers thickening around him from all quarters, but dreading less the indignation of the empire than the anathema of the Roman See, he yielded to the dictation of the pope and confirmed the clergy in all their privileges, sanctioned all their abuses, protected them in all their possessions, and made them entirely independent of the secular power.

The papal power, at the period of Frederic II., seemed to tremble on the verge of inevitable destruction; but by a profound and unscrupulous policy, and a system of crafty intrigues, aided by a political machinery whose various parts ramified every portion of the empire, and acted in concert through all ages and dynasties, it had steadily carried its advancements through the blood of millions and the ruins of thrones, until, at the time of Charles, it had regained its supremacy in the empire; and dictated treaties to the emperors, measures to the diets, and laws to the people. A power that could at its option excite or quell a popular outburst, create or destroy a dynasty, might be an object of terror to people and princes, but never an object of reverence. The dread it cast on the mind was always unpleasant, and in proportion as its power became oppressive and disadvantageous, opposition and resistance were inevitably excited. The love of independence, the native individualism of the Germanic character, was always a mortal foe to papal despotism. It might be cowered into silence, but it still grew in vigor, became more impatient as the pope became more despotic, and bolder as it became more conscious of its numerical strength. This spirit, in 1411, when Sigismund became Emperor of Germany, displayed an energy prophetic of stirring events and important consequences. The spirit of Germanic individualism led distinguished men of the nation to deny, with emphatic boldness, the pretensions of the pope; to denounce the profligacy of the clergy; and to demand in the body and head of the church a thorough reformation. Prominent among the apostles of religious freedom, which rose into consequence at that time, was John Huss, and his disciples. The success of these reformers excited and alarmed the pope. Hating any semblance of a right to participate in his authority, or to assume any approach to an equality with him, he was strongly averse to the assembling of a deliberative council; but conscious that his divine attributes and prerogatives were not adequate to the existing emergency, he consented that the Council of Constance should be called, on condition that it should adopt the most energetic means for the extirpation of the heretics.. With the secret design of betraying the amiable reformer, John Huss, he was invited to respond in person to a summons of the council. To quiet his apprehensions of danger, the emperor furnished him with a safe conduct, and the pope pledged his honor to protect him from harm. Thus guarded by the honor of the state and the church, he was, notwithstanding, perfidiously betrayed, and condemned to be burnt alive. The perfidy of the infallible pope is justified by the saints and authorities of the Catholic church, on the ground that no pledge, assurance, or oath, can rightfully protect a heretic from punishment. Sigis-mund attended the horrid ceremonies; and being reminded by a by-stander that the course of the wind might bear an offensive efluvia to the position he occupied, answered: "The odor of a burning heretic can never be offensive to Sigismund."

The death of John Huss was terribly revenged. The stake became the watchword of union. The hitherto mild and submissive reformers became desperate revengers. Churches and convents were burnt; monks and priests slaughtered without mercy. The insurgents met and defeated the imperial forces. The strongest armies of the cross withered before their ferocity. For fifteen years they devastated the Papal dominions, and shook the government with the violence of their retribution. Seeing it impossible to restrain their rage, Sigismund obliged the Council of Basle to negotiate with them for the adjustment of their difficulties. This politic measure so incensed Pope Eugenius IV., whose uncompromising vengeance longed for the extermination of every opponent to papal despotism, that he ordered his legates to dissolve the obnoxious assembly. But the laity had advanced in liberality and knowledge far beyond the possible attainment of a papal despot, and in defiance of his maledictions and intrigues, continued their useful session, and terminated, by peaceful concessions, the war with the Hussites.