Europe united under the one true God

I just watched the series knightfall, in this series the Pope in 1300 wants to unify Europe in a way that "there are no more kings, nobles and nations in Europe. Only the Pope leading Europe united under the one true God. ''
I would like to know if there is any real or fictitious history in which the Pope unites Europe under a single nation
 
Europe united under the one true God

I just watched the series knightfall, in this series the Pope in 1300 wants to unify Europe in a way that "there are no more kings, nobles and nations in Europe. Only the Pope leading Europe united under the one true God. ''
I would like to know if there is any real or fictitious history in which the Pope unites Europe under a single nation
Maybe look at this: https://en.wikipedia.org/wiki/Unam_sanctam and the ideology around it.
It's the same Pope from the show, so far the series is just OTL with some heavy Christian themes
 
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