Reforms of a long lived Julius Caesar

Assume the following:
- Caesar survives his assassination or avoids it, and lives to die of natural causes around age 75, in 24 BC. A long life, yes, but no longer than Augustus, who was never the picture of health.
- He does not want anyone to be able to easily accumulate the same power he has to rule the Republic on their own, after he is gone, and wishes to leave behind something that would be recognized as Republican in government. Dvided power, checks and balances, regular elections, the whole shebang.

With those extra 20 years, and acknowledging his limits as a man of his times, albeit a very innovative one, how much can Caesar do to those ends?
 
With those extra 20 years, and acknowledging his limits as a man of his times, albeit a very innovative one, how much can Caesar do to those ends?
I think it depends, giving the charismatic nature of Caesarian rule, on how well he does face to the Liberatores in a first time, then Parthians in a second time.

His survival would possibly tone down the ambitious among the Caesarian side, so I don't see why he wouldn't deal at least as much efficiently against the formers militarily-wise.
But the relative easiness on which Liberatores managed to organize themselves inside the Senate might be a wake-up call for Caesar : he simply can't let Rome with such a threat in his backside, would it be to deal with his wannabee executors, or to a long Parthian campaign : the second might be delayed more or less importantly IMO, to allow Caesar to protect himself.

First, I'd expect proscriptions to happen quickly and violently : the word of the hour would be, then, "Purge" and giving the popular support he still beneficied from, it wouldn't be really opposed. The question would be how to deal with a Senate that, even emptied out of most conspirational elements, would still have a pretty much lukewarm majority. Caesar will have to appear as the concilant and generous man there, would it be only for good PR, but as well to not turn the whole of late republican families against him : he needs the general neutrality of these if he wants to be able to leave Rome with a sound mind.

I do not know nearly enough about the legal and institutional mechanism of the Late Republic to be sure, but I would expect the promotion of "new blood" in the Senate, in a less traditional fashion than the cursus honorum as he already began to do before his assassination IOTL. Maybe it could be doubled with a more military organisation for provinces, making these possible peripherical support against possible political outbursts : giving the likely provincialisation of Italy, it would make sense.
Eventually, the abandon to consularship to his protégés, while he would keep the dictatorial title would hint to me, at a delegative personal power, doubled of an appointed meritocracy for political/administrative positions : ITTL we might see a greater political selections of candidates, perhaps, for what matter the increasingly ritualized election?

The following issue would be the Parthian campaign Caesar envisioned : IOTL, Marc Antony simply butchered it, but he had less ressources and, frankly, less political and military skill than Caesar had. But Caesar's objectives weren't that clear, possibly on purpose : after all, he didn't have a really precise idea of what would happen in Gaul in -58. It's possible that Caesar would be content with a relatively limited conflict, in order to reaffirm Roman control over its clients, and maybe form a cordon sanitaire to held in check Parthian ambitions : but I think Caesar may avoid to be extra-ambitious there. Would it fail to meet the expectations of Roman people and/or Roman elites, Caesar might be in a difficult position and forced to make several concessions on his previous policies.

If it's the case, I would tend to think that a conflict with Dacians might be the next logical steps, would it be to deal with their relatively troublesome neighbouring.
 
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