>Carthaginians >Persians >Huns Out of these three tough

>>2424821
Other Romans

>>2424832
fpbp

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Pontus for the meme-factor.

Degeneracy/decadence

>>2424821
>arch-nemesis
Out of your choices the persians were the only ones with any staying power, but they weren't really ever meaningfully dangerous to Rome until the split, so eh.
The germs are actually a valid choice, no matter how much you dislike it. Yeah, Rome kicked their ass multiple times, but then Rome kicked everyone's ass. At least the germs were a constant threat from the mid republic till the fall of the empire, who else can say that?

>>2424832
Honestly this

I can see a point being made for Carthage since they were the only true rival Rome had in the Republic era.
Maybe the Sassanids for the later western empire

>>2424821
>If you say this, you're a dumbass with poor historical knowledge
The Romans spent a lot more time fighting the Germans than they did the Huns you tard, not to mention using the term "Persians" for anything after Alexander is just blatantly generic, just because Parthian tribes conquered Media Atropatene, doesn't mean say tribes are "Persian" nor does that transfer to the Sassanids. Rome's principal enemies were, in no particular order: The Samnites/Latin Tribes, the Greeks in the Apennine Peninsula and Sicily, or the Greeks in general I guess, The Carthaginians, the Diadochi in general (you may include Epirus, Macedon, Selucids, and Ptolemy, I wouldn't include Pontus in that personally), Carthaginians, Gauls from Northern Italy to Gaul proper, the Armenians and Pontus, the Parthians/Sassanids, and thats pretty much it.

>>2424821
Germanics, the fifth column won in the end

carthage not even a competition

punic wars defined them. rome became the dominant power in the med after defeating carthage

>>2425484
>carthage not even a competition
>Rome's big bad died half way through the first season.

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>>2424832
This. Rome got too big and like anything that becomes too big it divided.

But to answer OP. Carthage even though it was pretty short. It put Rome on the tracks to become what it would be later.