I got it! However, I must admit I did get a little help. While I was looking up all the references in the line 505-510 I hit it.
cipio the highth of Rome . With tract oblique [ 510 ]
t first, as one who sought access, but feard
o interrupt, side-long he works his way.
s when a Ship by skilful Stearsman wrought
igh Rivers mouth or Foreland, where the Wind
Even more interesting to me is that each of these references (Illyria chang'd
Hermione and Cadmus, or the God In Epidaurus, Ammonian Jove, and Scipio) are positive -- not evil. All of comparisons Milton make to Satan are complimentary. Especially this one:
The God. Ã†sculapius, the god of healing, appeared in his temple in Epidaurus in the body of a serpent.
Milton is essential equating Satan with a god. I think Mr. Milton's poem is a celebration of the fact that Eve was brave enough to reach for that apple, bring knowledge to all of her descendants.
p.s. I hope you know you kept me up late -- didn't think I could go to bed without solving your riddle, did you?