When Alexander V's successor, the antipope John XXIII (not to be confused with the modern pope by the same name), authorized the selling of indulgences to raise funds for his crusade against one of his rivals, Huss was scandalized and further radicalized. The pope was acting in mere self-interest, and Huss could no longer justify the pope's moral authority. He leaned even more heavily on the Bible, which he proclaimed the final authority for the church. Huss further argued that the Czech people were being exploited by the pope's indulgences, which was a not-so-veiled attack on the Bohemian king, who earned a cut of the indulgence proceeds.
Scripture rebel
With that Huss lost the support of his king. His excommunication, which had been tacitly dropped, was now revived, and an interdict was put upon the city of Prague: no citizen could receive Communion or be buried on church grounds as long as Huss continued his ministry. To spare the city, Huss withdrew to the countryside toward the end of 1412. He spent the next two years in feverish literary activity, composing a number of treatises. The most important was The Church, which he sent to Prague to be read publicly. In it he argued that Christ alone is head of the church, that a pope "through ignorance and love of money" can make many mistakes, and that to rebel against an erring pope is to obey Christ.
In November 1414, the Council of Constance assembled, and Huss was urged by Holy Roman Emperor Sigismund to come and give an account of his doctrine. Because he was promised safe conduct, and because of the importance of the council (which promised significant church reforms), Huss went. When he arrived, however, he was immediately arrested, and he remained imprisoned for months. Instead of a hearing, Huss was eventually hauled before authorities in chains and asked merely to recant his views.
When he saw he wasn't to be given a forum for explaining his ideas, let alone a fair hearing, he finally said, "I appeal to Jesus Christ, the only judge who is almighty and completely just. In his hands I plead my cause, not on the basis of false witnesses and erring councils, but on truth and justice." He was taken to his cell, where many pleaded with him to recant. On July 6, 1415, he was taken to the cathedral, dressed in his priestly garments, then stripped of them one by one. He refused one last chance to recant at the stake, where he prayed, "Lord Jesus, it is for thee that I patiently endure this cruel death. I pray thee to have mercy on my enemies." He was heard reciting the Psalms as the flames engulfed him.
His executioners scooped up his ashes and tossed them into a lake so that nothing would remain of the "heretic," but some Czechs collected bits of soil from the ground where Huss had died and took them back to Bohemia as a memorial.
Bohemians were furious with the execution and repudiated the council; over the next several years, a coalition of Hussites, radical Taborites, and others refused to submit to the authority of the Holy Roman emperor or the church and fended off three military assaults. Bohemia eventually reconciled with the rest of western Christendom—though on its own terms (for example, it was one of the few Catholic regions that offered Communion of both bread and wine; the rest of Christendom simply received the bread). Those who repudiated this last compromise formed the Unitas Fratrum ("Union of Brethren"), which became the foundation for the Moravian Brethren (Moravia is a region in the Czech Republic), who would play an influential role in the conversion of the Wesley brothers, among others.