Would it be acceptable to write fic about
the first sack of Rome with Germania accompanying the Gauls? As amusing as it would be for baby!Belgium and baby!France to siege teenage!Rome (and his sacred geese) I'd love for that to be the first time Rome and Germania met. Plus Germania seems to be a stand-in for the barbarian tribes anyway.
(also Rome had to pay him to go away. Tell me that wouldn't be funnier with Germania)