By the early fourteenth century, the city of Florence had emerged as an economic power in Tuscany, surpassing even Siena, which had previously been the banking center of the region. In the space of fifty years, during the lifetime of Dante Alighieri, 1265-1321, Florence had transformed itself from a political and economic backwater—scarcely keeping pace with its Tuscan neighbors—to one of the richest and most influential places on the continent. While many historians have...