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As an amateur in Roman history, I'm always wondered about how to prevent the fall of Roman Empire.
And when talking about fall of Roman Empire, we always come to two crucial regions, Persia and Germania.
So here I have a question, did Rome need to conquer both of Germania (up to Vistula-Carpathians-Dniester line) and Persia (either up to Zagros mountains or Oxus/Indus rivers) to ensure her survival, or she only need to conquer just one of them...?
(and btw guys, is there any TL in this forum about surviving Rome that use Vistula/Zagros borders...?)
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