The first measure Alexander used against the growing power of Savonarola was to declare him heretic, and as such banished from the pulpit; but Savonarola had eluded this prohibition by making his pupil and friend, Domenico Bonvicini di Pescia, preach in his stead. The result was that the master’s teachings were issued from other lips, and that was all; the seed, though scattered by another hand, fell none the less on fertile soil, where it would soon burst into flower. Moreover, Savonarola now set an example that was followed to good purpose by Luther, when, twenty-two years later, he burned Leo X’s bull of excommunication at Wittenberg; he was weary of silence, so he declared, on the authority of Pope Pelagius, that an unjust excommunication had no efficacy, and that the person excommunicated unjustly did not even need to get absolution. So on Christmas Day, 1497, he declared that by the inspiration of God he renounced his obedience to a corrupt master; and he began to preach once more in the cathedral, with a success that was all the greater for the interruption, and an influence far more formidable than before, because it was strengthened by that sympathy of the masses which an unjust persecution always inspires.
Then Alexander made overtures to Leonardo dei Medici, vicar of the archbishopric of Florence, to obtain the punishment of the rebel: Leonardo, in obedience to the orders he received, from Rome, issued a mandate forbidding the faithful to attend at Savonarola’s sermons. After this mandate, any who should hear the discourses of the excommunicated monk would be refused communion and confession; and as when they died they would be contaminated with heresy, in consequence of their spiritual intercourse with a heretic, their dead bodies would be dragged on a hurdle and deprived of the rights of sepulture. Savonarola appealed from the mandate of his superior both to the people and to the Signoria, and the two together gave orders to the episcopal vicar to leave Florence within two hours: this happened at the beginning of the year 1498.