Girolamo Savonarola
From Conservapedia
Girolamo Savonarola (1452-1498) was a Dominican friar in Florence who challenged the authority of pope Alexander VI with fiery sermons and, after his excommunication, saying Mass without authority to do so. His outspokenness against immorality in the Catholic Church and in the powerful Medici family won Savonarola many supporters at first, but eventually the people of Florence turned against him, stormed his monastery, took him prisoner, and then tortured him until he confessed to heresy and sedition. He then, along with two associates, was stripped of his clerical status, then taken out to Florence's public square, hung by chains to a large cross, and burned.