From the Taking of Jerusalem by Antiochus Epiphanes to the Death of Herod the Great - Flavius Josephus

6. Now although the place where he built was greatly opposite to his
purposes, yet did he so fully struggle with that difficulty, that the firmness of
his building could not easily be conquered by the sea; and the beauty and
ornament of the works were such, as though he had not had any difficulty in
the operation; for when he had measured out as large a space as we have
before mentioned, he let down stones into twenty fathom water, the greatest
part of which were fifty feet in length, and nine in depth, and ten in breadth,
and some still larger. But when the haven was filled up to that depth, he
enlarged that wall which was thus already extant above the sea, till it was
two hundred feet wide; one hundred of which had buildings before it, in
order to break the force of the waves, whence it was called Procumatia, or
the first breaker of the waves; but the rest of the space was under a stone wall
that ran round it. On this wall were very large towers, the principal and most
beautiful of which was called Drusium, from Drusus, who was son-in-law to
Caesar.
7. There were also a great number of arches, where the mariners dwelt;
and all the places before them round about was a large valley, or walk, for a
quay [or landing-place] to those that came on shore; but the entrance was on
the north, because the north wind was there the most gentle of all the winds.
At the mouth of the haven were on each side three great Colossi, supported
by pillars, where those Colossi that are on your left hand as you sail into the
port are supported by a solid tower; but those on the right hand are supported
by two upright stones joined together, which stones were larger than that
tower which was on the other side of the entrance. Now there were continual
edifices joined to the haven, which were also themselves of white stone; and
to this haven did the narrow streets of the city lead, and were built at equal
distances one from another. And over against the mouth of the haven, upon
an elevation, there was a temple for Caesar, which was excellent both in
beauty and largeness; and therein was a Colossus of Caesar, not less than that
of Jupiter Olympius, which it was made to resemble. The other Colossus of
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