Ancient times
It is the ancient Caieta, situated on the slopes of the Torre di Orlando, a promontory overlooking the Mediterranean Sea. Gaeta was an ancient Ionian colony of the Samians according to Strabo, who believed the name stemmed from the Greek kaiétas, which means "cave", probably referring to the several harbours. According to Virgil's Aeneid (vii.1–9), Caieta was Aeneas’ (another legend says Ascanius') wet-nurse, whom he buried here.
In the classical age Caieta, famous for its lovely and temperate climate, like the neighbouring Formia and Sperlonga, was a tourist resort and site of the seaside villas of many important and rich characters of Rome. Like the other Roman resorts, Caieta was linked to the capital of the Empire by Via Appia and its end trunk Via Flacca (or Valeria), through an opposite diverticulum or bye-road. Its port was of great importance in trade and in war, and was restored under Emperor Antoninus Pius. Among its antiquities is the mausoleum of Lucius Munatius Plancus.
Middle Ages
At the beginning of the Middle Ages, after the Lombard invasion, Gaeta remained under suzerainty of the Byzantine Empire. In the following years, like Amalfi, Sorrento and Naples, it would seem to have established itself as a practically independent port and to have carried on a thriving trade with the Levant.
As Byzantine influence declined in Southern Italy the town began to grow. For fear of the Saracens, in 840 the inhabitants of the neighbouring Formiæ fled to Gaeta. Though under the suzerainty of Byzantium, Gaeta had then, like nearby ports Naples and Amalfi, a republican form of government with a dux ("duke", or commanding lord under the command of the Byzantine Exarch of Ravenna), as a strong bulwark against Saracen invasion.
Around 830, it became a lordship ruled by hereditary hypati, or consuls: the first of these was Constantine (839–866), who in 847 aided Pope Leo IV in the naval fight
