The volume offers a chronological civil history of the southern Italian kingdom, tracing the migrations and origins of Germanic groups, their settlement in Pannonia, and subsequent incursions into the peninsula. It examines ancient and medieval authorities to debate ethnogenesis and the etymology of the Lombard name, records sequences of rulers and dynastic successions, and recounts alliances and military episodes that enabled Lombard entry and conquest in Italian regions. The narrative blends source criticism, genealogical lists, and descriptions of territorial acquisitions and political arrangements to explain how these peoples established lasting rule in parts of Italy.