Octavianus marked it.

But it was the war with Sextus Pompeius which clearly showed what the
future of Ravenna was to be. In that affair we find Ravenna already
established as a naval port apparently subsidiary, on that coast, to
Brundusium, as Misenum was upon the Tyrrhene sea to Puteoli; and there
Octavianus built ships.

It was not, however, till Octavianus, his enemies one and all disposed
of, had made himself emperor at last, that, on the establishment and
general regulation of his great government, he chose Ravenna as the
major naval port of Italy upon the east, even as he chose Misenum upon
the west.

Octavianus had learned two things, certainly, in the wars he had
fought to establish himself in the monarchy his great-uncle had
founded. He had learned the necessity and the value of sea power, and
he had understood the unique position of Ravenna in relation to the
East and the West. That he had been able to appreciate both these
facts is enough to mark him as the great man he was.

Julius Caesar, for all his mighty grasp of reality, had not perceived
the enormous value, nay the necessity, of sea power, and because of
this failure his career had been twice nearly cut short; at Ilerda,
where the naval victory of Decimus Brutus over the Massiliots alone
saved him; and at Alexandria. Both the liberators and Antony had
possessed ships; but both had failed to use them with any real effect.
It was Sextus Pompeius who forced Octavianus to turn to the sea, and
when Octavianus became Augustus he did not forget the lesson. Sole
master of the Mediterranean and of all its ships of war, he understood
at once how great a support sea power offered him and his principate.
Nor was the empire, while it was vigorous, though always fearful of
and averse from the sea, ever to forget the power that lay in that
command.

Thus it was that among the first acts of Augustus was the
establishment of two fleets, as we might say, "in being" in the
Mediterranean; the fleet of Misenum and the fleet of Ravenna; the
latter with stations probably at Aquileia, Brundusium, the Piraeus,
and probably elsewhere.

The fleet of Ravenna was, certainly after A.D. 70, probably about A.D.
127, entitled _Praetoria_. The origin of this title is unknown, but it
was also borne by the fleet of Misenum and it distinguishes the
Italian from the later Provincial fleets, the former being in closer
relation to the emperor, just as the Praetorian cohorts were
d