Well how about Germanicus, tamer of the Germanic Women, subduer of the men, and avenger of the great massacre of the Teutoburg Forest?
I would have to say Heraclius doesn't count, first off he is definitely post Roman, it was under his reign that the old Roman titles, the latin language, and other connections to Rome ceased having any importance in Byzantine Greece.
Second even if he was in 75 BC his performance against the rise of Islam was pathetic. On the one hand you could say he used up all of his resources against Persia, but if that is the reason he lost so much of his empire to the rising Islamic Empire isn't that his fault for using up all of his resources in a single campaign? True he wasn't the field commander who lost to invaders, but an emperor is not suppose to need to be everywere at once and he picked the losing field officer.
Maybe he was in an impossible situation, or maybe he failed to muster his resources well the way many earlier emperors did?
Sulla's battles against Mithradates were extrodinary, he managed the first one while losing under 20 men, so I don't think he is overestimated.
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