Nicholas confined himself to a few exhortations addressed to the faithful, and died without having removed any of the difficulties which opposed themselves to the undertaking of a holy war. Calixtus III., who succeeded him, showed more zeal, and at the very commencement of his pontificate, he sent legates and preachers throughout Europe, to proclaim a crusade and levy tenths. An embassy from the pontiff went to solicit the kings of Persia and Armenia, and the khan of the Tartars, to unite with the Christians of the West, to make war against the Turks. Sixteen galleys, constructed with the produce of the tenths, put to sea under the command of the patriarch of Aquileia, and displayed the banner of St. Peter in the Archipelago, and on the coasts of Asia Minor; Æneas Sylvius harangued the pope in the name of the emperor of Germany, and promised him the concurrence of all the powers of Christendom, if his holiness opened the treasures of the Church, and, by his evangelical exhortations, called all the workmen to the harvest. Calixtus III. thanked the head of the empire for his advice, and pressed him to set the example. But the indolent Frederick contented himself with renewing his promises; and whilst the emperor was thus exhorting the pope to maintain a crusade, and that the pope, on his side, was urging the emperor to take arms, the Ottomans penetrated into Hungary, and advanced against Belgrade.
This city, one of the bulwarks of the West, received no succour from Christendom. There remained no hope for it but in the valour of Hunniades, and in the apostolic zeal of John of Capistran. The one commanded the troops of the Hungarians, and excited them by his example; the other, who, by his preachings had got together a great number of German Crusaders, animated the Christian soldiers, and inspired them with an invincible ardour.
Contemporary chronicles inform us, that at this period a hairy comet appeared blazing in the east. The Christian nations believed they saw in this phenomenon a prophetic signal of the greatest evils; and as the evil then most to be dreaded was the invasion of the Turks, Calixtus was desirous of profiting by this feeling of the people, to revive the idea of a crusade. He exhorted the Christians to penitence; and pointed out the holy war as a means by which they might expiate their sins and appease the anger of Heaven.
In no country, notwithstanding, did the people arm, except in those that were immediately menaced by the Turks. It was at this time that the pope ordered that every day at noon, the bells should be rung in all parishes, to call upon the faithful to pray for the Hungarians, and for those who were contending with the Turks. Calixtus granted indulgences to all Christians who, at this signal, would repeat the Dominical prayer and the angelic salutation three times. Such was the origin of the Angelus, which the customs of the Church have consecrated, and continued to modern times.
Heaven was doubtless touched by these fervent prayers, which arose at the same time and together, from all parts of Christian Europe. On the 6th of August, 1456, the Turks were defeated under the walls of Belgrade, which they had besieged forty days, and which they had threatened to treat in the same manner as they had treated the Greek capital. The presence of Hunniades and the ardent zeal of John Capistran had so excited the valour of the Hungarians, that they destroyed the Ottoman fleet, which covered the Danube and the Save, and the army commanded by Mahomet himself. More than twenty thousand Mussulmans lost their lives in the battle; the sultan was wounded amidst his janissaries, and escaped the pursuit of the victors with much difficulty. All Europe returned Heaven thanks for a victory, for the obtaining of which it had only concurred by its prayers, and which it must have considered a miracle. The tent and the arms of Mahomet were sent to the pope, as a trophy of the holy war, and as a homage rendered to the father of the faithful. Religion celebrated by its ceremonies, a day in which its most cruel enemies had been vanquished. The festival of the Transfiguration, instituted by a bull of the pope, and marked to take place on the 6th of August, reminded the universal Church, every year, of the defeat of the Turks before Belgrade.
Hunniades and Capistran did not long survive their triumphs; but both died whilst Christendom was still mixing their names with hymns of gratitude. The passion of jealousy empoisoned their last moments; and the scarcely evangelical warmth with which each of them claimed the honour of having saved Belgrade, left a stain upon their renown. Æneas Sylvius, when commending their memory to the esteem of posterity, celebrates the virtues of Capistran, and expresses astonishment that an humble cenobite, who had trampled under-foot all the riches of this world, should not have had sufficient strength to resist the charms of glory.
Whilst the Hungarians were beating the Turks before Belgrade, the pope’s fleet gained some advantages in the Archipelago. Calixtus took care not to neglect to remind the faithful of the exploits and triumphs of the patriarch of Aquileia; persuaded that the news of victories gained over the Mussulmans would restore hope and courage to all those whom the reverses of the Christians had discouraged and terrified. A fresh crusade was preached in France, England, Germany, and even in the kingdoms of Castile, Arragon, and Portugal. The people everywhere listened with pious seriousness to the preachers of the crusade; but murmurs generally arose against the levying of the tenths. The clergy of Rouen, with the university and parliament of Paris, opposed the impost openly. In Germany complaints were more violent than elsewhere. In proportion as the spirit of the holy wars cooled, the means employed by the popes to renew these distant expeditions were judged with greater severity. It must likewise be admitted, that there were great abuses in the collection and the employment of the tenths. An open traffic of the indulgences of the court of Rome for the crusade was carried on, and the tribunal of penitence, on certain occasions, seemed to be nothing but a means of levying taxes upon the faithful. It was only by money that the favours of the Church and the mercies of Heaven could be obtained; the sins of Christians might be said, in some sort, to have a tariff; and we find in the history of Arragon, that disobedience to the decrees of the pope even had become the source of a new tribute. It may be remembered that the sovereign pontiffs had frequently forbidden Christians to convey munitions or arms to the infidels. The trade of the maritime cities often braved the menaces of the Holy See, and avarice led the merchants to transgress the severest orders on this point. A sum of money was then required, in the name of the pope, of all who were accused of this offence. They were condemned to pay the fourth or the fifth of the profits arising from their illicit commerce. Commissaries were appointed to levy this impost, and decrees regulated the collection of it, as in that of all other public revenues.
But that which most completely exposes the spirit of this age, and particularly that of the court of Rome, is, that in the preachings of the crusades, the faithful were much less earnestly exhorted to take arms than to pay a tribute in money. The levies raised in the name of the Holy See, were termed succours for the Hungarians; and as the Hungarians always stood in need of being succoured, the levying of the tenths became a permanent state of things, which the people and the clergy endured every day with less patience and resignation.
We ought likewise to add, that the Holy See did not always receive the produce of the tribute it imposed upon the Christians. Princes, under pretence of making war against the Turks, sometimes took possession of it; and the tenths destined for the holy war were too often employed in carrying out the quarrels of ambition.