During this period, the Dominican friar Girolamo Savonarola had become prior of the San Marco monastery in 1490. He was famed for his penitential sermons, lambasting what he viewed as widespread immorality and attachment to material riches. He praised the exile of the Medici as the work of God, punishing them for their decadence. He seized the opportunity to carry through political reforms leading to a more democratic rule. But when Savonarola publicly accused Pope Alexander VI of corruption, he was banned from speaking in public. When he broke this ban, he was excommunicated. The Florentines, tired of his extreme teachings, turned against him and arrested him. He was convicted as a heretic and burned at the stake on the Piazza della Signoria on 23 May 1498.