Art thou he of whom I have spoken in old time - This prophecy concerning Antiochus and the Jews was delivered about four hundred years before the events took place. - Martin. Calmet maintains that Cambyses is spoken of, and refers to ancient prophecies, especially Isaiah 14, Isaiah 15:1-9, Isaiah 16:1-14, Isaiah 20:1-6, 21.
Gog - is not mentioned by name in any existing prophecy before Ezekiel‘s time. The reference here shows
(1) that the conflict with Gog does not represent a particular event, but one of which the prophets in general had to speak;
(2) that in the interpretation of Old Testament prophecy we are to look beyond special fulfillments.
Events in the world‘s history come within a prophet‘s ken as parts of the divine administration whereby evil struggles against but is overcome by good. As every such conflict is a prelude to the final struggle, so its prediction has reference ultimately to the consummation here foretold.