CAIETAE PORTUS, an ancient harbour of Latium adiec tum, Italy, in the territory of Formiae, from which it is 5 m. S.W. The name (originally Ais rj) is generally derived from the nurse of Aeneas. The coast of the gulf not only between Caietae Portus and Formiae, but east of the latter also, as far as the modern Monte Scauri, was a favourite summer resort of the Romans (see FORMIAE) . After the destruction of Formiae in A.D. 847 it became one of the most important seaports of central Italy (see GAETA). In the town are scanty remains of an amphitheatre and theatre : near the church of La Trinita, higher up, are remains of a large reservoir. There are also traces of an aqueduct. The promontory (548 ft.) is crowned by the tomb of Munatius Plan cus, founder of Lugdunum (mod. Lyons), who died after 22. B.C.