One remark: I do not find the new borders of provinces quite feasible. I suggest an horizontal division, with the lower part being Babylonia, the middle being Mesopotamia and the upper part being Assyria. Keep i mind that many cities were on both sides of the rivers and the river were their highways.
Yes, I thought about the best way to divide Mesopotamia into provinces. But then, I tried to follow the Romans' conception of geography and cultural regions. Take a look on the Roman provincial borders in Gaul: They don't comply with our idea of an efficient and rational administration, but follow the cultural areas named by Caesar in the first lines of
De Bello Gallico.
I did the same with the provinces of Mesopotamia: Looked on how Trajan set up the two provinces of Mesopotamia and Assyria, took a look on Ptolemy (who adds the area of Babylonia), and draw them on the map.
Roman provinces are more about historical and cultural regions than about administrative or economic units.
Those are where Trajan mostly set up his provinces.
Exactly.
Maybe the new Emperor should bring in Hadrian to help him with administration and/or management?
Hadrian was indeed a superb administrator, but under the new emperor Quietus his goal is not to attract attention. Because if he does look too powerful, Quietus will not hesitate to kill him.
Although they could just build a larger population there and simply feed itself or something.
That's the plan. Egypt and Africa are enough to nourish Rome, Mesopotamia will feed itself and the troops that will be formed there.
Any plans to deal with the Germans
No. The Romans understand that it's much more effective to disunite the Germans than to unite them by attacking Germania.
Also possibly building a substantial military base on the Caspian sea so that they could both have the new Eastern provinces be bale to trade with the Scythians on the northern shore as well as being able to be able to swiftly attack anyone in the area with superior Naval strength,
Ah, I think I will add a whole episode just dealing what the Romans do with the new provinces. Thanks for the inspiration.
and maybe have a small isolated province at the mouth of the Volga river where Astrakhan would be similar to Roman territory in Crimea?
OTL's isolated province at the in Crimea was an old hellenistic kingdom set up there during the great Greek colonization of the 8th century BCE.
There is no such territory on the Caspian sea.
Besides the prestige of controlling Stalingrad, there is no reason for the Romans to expand in the Volga region.
It's interesting to see this sort of timeline. Rome's economic stagnation IOTL might well have been connected to the halt in expansion after Trajan,
I had the same thought.
so I wonder how long it can keep up ITTL before the need for change is unavoidable.
The change might come even sooner with the "overextension" of the empire and contacts to the Far East.
Egyptian grain was carried in HUGE boats and was fairly easy to transport, while Mesopotamia would require a land based route over desert, mountains, and generally not to desirable weather. While they could circumnavigate Arabia and use the old Canal of the Pharaohs that linked the red sea to the Nile. But the costs of such a journey would probably outweigh whatever profit could be gained so the treacherous land route it is!
The question is: Do the Romans need the additional grain? I don't think so. It's much more profitable to let the native sell the grain as they did is for centuries, and then pocket the tax revenues of a flourishing economy.
can you afford to garrison the new lands strongly enought?
I can't... But the Romans can with Mesopotamia's enormous tax revenue.
I wonder how this alternate Emperor is going to handle Britain, would he perhaps see conquering Caledonia as a cheaper alternative than building a large wall? I doubt walls like that are cheap.
Why don't you write this TL?

This exactly what I thought would have been Quietus' plan.
