During the forty years of the second great schism in the Roman Catholic Church, 1378-1417, different parties adhered to different popes, of whom there were sometimes two or more simultaneously in office. The French cardinals preferred Avignon—to which the holy see had been removed in 1309—as the seat of the pope, the Italian cardinals preferred Rome, and two lines of popes were consequently chosen. This division proved extremely injurious to the papal power and authority.

Meanwhile there were various efforts for reform in the Church, among the most notable movements being those led by John Wycliffe in England and John Huss on the Continent. At last a council was called to decide who was the rightful claimant to the papal throne. The council assembled at Pisa, Italy, in 1409, but recognized neither of the then rival popes—Gregory XII and Benedict XIII—Alexander V being elected in their stead. The deposed popes, however, would not give up their rule, and so the action of the council added to the difficulty, since there were now three popes instead of two.

Alexander V died ten months after his election, and the cardinals chose as his successor Cardinal Cossa, who took the name of John XXIII. The Church remained as much divided as before. In 1412 Pope John, who was a shrewd and politic man, opened at Rome a council for the reformation of the Church, but there seems to have been little serious purpose either on the part of John himself or of the ecclesiastics who assembled; and practically nothing was done.

John was more concerned about his political relations with various sovereigns. He was at war with Ladislaus, King of Naples, who soon drove him from Rome. John fled to Florence, and appealed to Sigismund, Emperor of the Holy Roman Empire, for assistance. But the Emperor would aid him only on condition that the Pope should summon a new council to some German city, in order to end the schism. At last John issued a formal summons for a council to meet at Constance on November 1, 1414. Before it assembled, Ladislaus died, and Sigismund determined to conduct the council in the interest of his imperial dignity and that of the German kingship, which he also held.

HE Council of Constance, like that of Pisa, had two very obvious questions to consider: (1) The restoration of unity; and (2), if the reforming party could have its way, the reform of the Church in its head and members. But circumstances forced the council to consider a third question, which had never been even touched in the discussions at Pisa. This was reformation in its widest sense; not merely a constitutional change in the relations of pope and hierarchy, but a vital change in dogma and ritual. This question was brought to the front by the so-called Hussite movement in Bohemia. The fundamental issues involved were those which have been at the bottom of most subsequent disputes in the Christian Church.

How far was the Christianity of the day unlike the Christianity to be found in the record of Christ and his apostles? And the difference, if any, was it a real and necessary difference consequent on the development of society, or was it the result of abuses and innovations introduced by fallible men? The orthodox took their stand upon the unity and authority of the Church. The Church was the true foundation of Christ and the inheritor of his spirit. Therefore what the Church believed and taught, that alone was the true Christian doctrine; and the forms and ceremonies of the Church were the necessary aids to faith. The reformers, on the other hand, looked to Scripture for the fundamental rules of life and conduct. Any deviation from these rules, no matter on what authority, must be superfluous and might very probably be harmful.

The Council of Constance is one of the most notable assemblies in the history of the world. In the number and fame of its members, in the importance of its objects, and, above all, in the dramatic interest of its records, it has few rivals. It is like the meeting of two worlds, the old and the new, the mediæval and the modern. We find there represented views which have hardly yet been fully accepted, which have occupied the best minds of succeeding centuries; at the same time, the council itself and its ceremonial carry us back to the times of the Roman Empire, when church and state were scarcely yet dual, and when Christianity was coextensive with one united empire. At Constance all the ideas, religious and political, of the Middle Ages seem to be put upon their trial. If that trial had ended in condemnation, there could be no fitter point to mark the division between mediæval and modern history. But the verdict was acquittal, or at least a partial aquittal; and the old system was allowed, under modified conditions, a lease of life for another century. It must not be forgotten that there were great secular as well as ecclestiasical interests involved in the council. Princes and nobles were present as well as cardinals and prelates. The council may be regarded not only as a great assembly of the Church, but also as a great diet of the mediæval empire.

The man who had done more than anyone to procure the summons of the council, and whose interests were most closely bound up in its success, was Sigismund, King of the Romans and potential Emperor. He was eager to terminate the schism, and to bring about such a reform in the Church as would prevent the recurrence of similar scandals. But his motive in this was not merely disinterested devotion to the interests of the Church. He wished to revive the prestige of the Holy Roman Empire, and to gratify his own personal vanity by posing as the secular head of Christendom and the arbiter of its disputes. More especially he wished to restore the authority of the monarchy in Germany, and to put an end to that anarchic independence of the princes of which the recent schism was both the illustration and the result.

In pursuing this aim he was confronted by the champions of "liberty" and princely interests, who were represented at Constance by the Archbishop of Mainz and Frederick of Hapsburg, Count of Tyrol. The Archbishop, John of Nassau, had been prominent in effecting and prolonging the schism in the Empire. He was a firm supporter of John XXIII, and had no interest in attending the council except to thwart the designs of the King, whom he had been the last to accept. Frederick of Tyrol was the youngest son of that duke Leopold who had fallen at Sempach in the war with the Swiss. Of his father's possessions Frederick had inherited Tyrol and the Swabian lands, and the propinquity of his territories made him a powerful personage at Constance. His family was the chief rival of the house of Luxemburg for ascendency in Eastern Germany, and he himself seems to have cherished a personal grudge against Sigismund. To these enemies Sigismund could oppose two loyal allies, the elector palatine Lewis, who had completely abandoned the anti-Luxemburg policy pursued by his father, Rupert, and Frederick of Hohenzollern, the most prominent representative of national sentiment in Germany, who had already given in Brandenburg an example of that restoration of order which he wished Sigismund to effect throughout his dominions.