Duchy of Sorrento
Originally, Sorrento was part of the Byzantine Duchy of Naples in the Dark Ages, but in the ninth century, along with Amalfi and Gaeta, it broke away from the Neapolitans to found its own ducatus (or republic). However, it mostly remained under Amalfi and only one independent duke is known from this period, a Sergius in the late ninth century.
- Gay, Jules. L'Italie méridionale et l'empire Byzantin. Burt Franklin: New York, 1904.
- Norwich, John Julius. The Normans in the South 1016-1130. Longmans: London, 1967.
- Chalandon, Ferdinand. Histoire de la domination normande en Italie et en Sicilie. Paris, 1907.
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