No previous work has examined political exclusion in Early Renaissance Florence or its significance for the transition from Florentine popular government to oligarchy. Between the fourteenth and the first half of the fifteenth century, political exclusion became a normal feature of political life, regardless of the type of political regime; it was an essential instrument by which new governments consolidated their control over the city and the countryside in one of the largest and most powerful cities of Early Renaissance Europe. Exclusion from the Republic of Florence - separation from friends and family, business and property, coupled with the degradation of public humiliation - engendered a new outlook on life. In Early Renaissance Florence, excluded citizens across social classes became common outlaws, no different for common criminals prosecuted for heresy, blasphemy, gambling, or sexual deviance. By investigating these practices and attitudes of Early Renaissance Florence, this book shows the dark side of Renaissance republicanism: its fear of political dissent in any form and its means to crush it at all costs. This study of the other side of Renaissance republicanism presents a new and crucial chapter in Renaissance history.