Portus Julius (alternatively spelled in the Latin Iulius) was the first harbour specifically constructed to be a base for the Roman western naval fleet, the classis Misenensis; the eastern fleet was based in the Port of Ravenna. The port was located at Misenum on a peninsula at the northern end of the Gulf of Naples. Portus Julius was named in honour of Octavian's (later to become Caesar Augustus) great-uncle and adoptive father, Julius Caesar and the Julian clan.
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