I have no idea. For the sake of discussion, I do not understand why the prophets have to be Hebrew and from the past.
What might seem to be the future could also be the past clearly revealed and intertwined with the future.
Why is this question important?
Based on the "Is there an Orthodox view of government?" thread currently running and the Vladimir Moss article cited by jckstraw72 (but not necessarily endorsing). If one considers the beast to be democracy, then I would pick Darius the Great and Xerxes the Great. They tried but failed to nip this beast in the bud. I prefer Cyrus the Great, but these two fit the bill better. I read Josephus's History of the Jews, so I could possibly make a somewhat contorted defense for this position.
Based on my plastic Mayan Long Count Calendar and my Apocalypse Decoder Ring from the Cracker Jacks 2012 World Series collection, my choice would be HAH Patriarch Bartholomew and
Pope Benedict XVI. I have no defense for this, but it seems reasonable under the time constraints given.