1452-1498. Italian reformer, a Dominican friar and an eloquent preacher. His crusade against political and religious corruption won him popular support, and in 1494 he led a revolt in Florence that expelled the ruling Medici family and established a democratic republic. His denunciations of Pope Alexander VI led to his excommunication in 1497, and in 1498 he was arrested, tortured, hanged, and burned for heresy.