From the earliest times, successive waves of foreign invaders have left their mark on Italy. Beginning with Germanic invasions that undermined the Roman Empire and culminating with the establishment of the modern nation, Girolamo Arnaldi explores the dynamic exchange between outsider and "native," liberally illustrated with interpretations of the foreigners drawn from a range of sources. A despairing Saint Jerome wrote, of the Sack of Rome by the Visigoths in 410, "My sobs stop me from dictating these words. Behold, the city that conquered the world has been conquered in its turn." Other...