Lucretia Borgia by Ferdinand Gregorovius,the German historian who specialized in the medieval history of Rome.Lucrezia Borgia was the daughter of Pope Alexander VI and Vannozza dei Cattanei. Her brothers included Cesare Borgia, Giovanni Borgia, and Gioffre Borgia.Lucrezia's family politics became subject matter for The Prince, where well-implemented ruthlessness represents a practical component of Machiavellian politics.