Here is a link to an interesting page on the Vatican’s influence on world politics: http://www.seawaves.us/na/koe/kings.html
Relevant verses from a historicist perspective, quoted from the above-mentioned page:
“The Bible tells us that the kings of the earth will gather together against God Almighty and his anointed Jesus Christ to do battle. This is found in 3 separate places in scripture so there can be no mistake as to what will happen.
 The kings of the earth set themselves, and the rulers take counsel together, against the LORD, and against his anointed, saying,
 The kings of the earth stood up, and the rulers were gathered together against the Lord, and against his Christ.
 And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet.
 For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.”