The Vandals sacked Rome during 14 days in 455 after they agree with Pope Leo I to do not destroy the city completely and respect their inhabitants, something that they only partially accomplished.
What could have happened if there is no agreement and the Vandals destroyed Rome (= their most symbolic and relevant buildings), including St Peter, and kills most of the nobility, the Pope and the Curia?
Would a new Pope and Curia appointed elsewhere (i.e. Ravenna)? What would be the fate of the moribund WRE then?