Last Possible POD to save the Roman Empire

To save the west you need to keep the empire united

Not necessarily. The Western Empire was still vastly more populous, wealthy and sophisticated than the Germanic tribes, even when the Germans were acting in concert. The idea that the West was some impoverished backwater that was doomed to fall without the East propping it up seems to have become received wisdom, but I can't see any justification for it.
 
Why should butterfly Islam? It could hamper the Islamic expansion westwards of Egypt through.

Adding to what's been said, two hundred years is over a dozen generations, that means the simple fact that alternate history makes butterflies means Mohammed likely will not be born.
 
Not necessarily. The Western Empire was still vastly more populous, wealthy and sophisticated than the Germanic tribes, even when the Germans were acting in concert. The idea that the West was some impoverished backwater that was doomed to fall without the East propping it up seems to have become received wisdom, but I can't see any justification for it.

Well, OTL the west was just not able to sustain the shock it faced in the 5th century without ending balkanized. While the east did.

The east could pay for its armies and fleet while the west could not and was compelled to give control of huge chunks of its territory to its germanic auxiliary troops in ordre to pay for their military service. This was the main cause of the crumble of the WRE : no longer being able to regain actual control on large parts of its territory.
 
Well, OTL the west was just not able to sustain the shock it faced in the 5th century without ending balkanized. While the east did.

The east could pay for its armies and fleet while the west could not and was compelled to give control of huge chunks of its territory to its germanic auxiliary troops in ordre to pay for their military service. This was the main cause of the crumble of the WRE : no longer being able to regain actual control on large parts of its territory.

Because of rampant tax evasion among the elite; if the West had been able to rein this in, the Emperor would have been in a much better position financially.
 
Because of rampant tax evasion among the elite; if the West had been able to rein this in, the Emperor would have been in a much better position financially.

But why do you think there was more tax evasion in the Western part than in the Eastern part of the Roman empire ?

Should the WRE have taxed more its aristocracy ? Theoretically yes.
However it did not. So the question is : why did it not ?

It's not because the western elite had less civic morals than the eastern elite. They were no more no less virtuous.

It was because the human and financial burden to sustain all the challenges the West faced were too heavy for its resources.
This is why the WRE decided to downsize by renouncing military presence in Britain.

They lacked men able to serve among the citizenry. So they outsourced their defence to germanic auxiliaries. And they paid a huge price for it, being forced to give-up de facto control of huge territories of the WRE so that the germanic auxiliary could finance the military service they owed to the WRE. The last roman army by itself, the Comitatus, remained in Italy to ensure the personal security and the waning power of an emperor whose real area of control was dramatically shrinking.

The urbanization in the WRE was also dramatically dropping because the economy of the WRE could no longer support the cost of the roman urban way of life plus the cost of defending the WRE against the various threats it had to face.

Isaac Asimov has remarkably reproduced the process in the first or second book of his Foundation series.
 
But why do you think there was more tax evasion in the Western part than in the Eastern part of the Roman empire ?

Should the WRE have taxed more its aristocracy ? Theoretically yes.
However it did not. So the question is : why did it not ?

It's not because the western elite had less civic morals than the eastern elite. They were no more no less virtuous.

It was because the human and financial burden to sustain all the challenges the West faced were too heavy for its resources.
This is why the WRE decided to downsize by renouncing military presence in Britain.

They lacked men able to serve among the citizenry. So they outsourced their defence to germanic auxiliaries. And they paid a huge price for it, being forced to give-up de facto control of huge territories of the WRE so that the germanic auxiliary could finance the military service they owed to the WRE. The last roman army by itself, the Comitatus, remained in Italy to ensure the personal security and the waning power of an emperor whose real area of control was dramatically shrinking.

The urbanization in the WRE was also dramatically dropping because the economy of the WRE could no longer support the cost of the roman urban way of life plus the cost of defending the WRE against the various threats it had to face.

Isaac Asimov has remarkably reproduced the process in the first or second book of his Foundation series.

I was basing my argument on Friell and Williams' The Rome That Did Not Fall (which I'd advise everybody to read, BTW, since it's very interesting and really covers the period in detail). They come to the conclusion that the Western tax system was indeed less efficient, based largely on the recorded expenditures of the Western Senators. These people were clearly enormously wealthy, so clearly there was plenty of money in the Western Empire. The problem was raising it.

(On a similar note, Roman tax collectors were permitted to keep a certain portion of the money they gathered in lieu of payment. I forget the precise figures, but the amount kept by Western tax collectors was several multiples of that kept by Eastern ones, and this disparity only increased as time went on. Again, less efficient government and tax systems.)

In the West there was much greater polarisation of wealth (a few very rich magnates -- Gaul and Italy were pretty much entirely controlled by a dozen or so families, IIRC -- and lots of very poor people), so the wealthy could use their resources to get out of paying their fair share (bribing tax officials etc., who tended to come from the upper classes anyway and so had a vested interest in taxes not being too stringently kept), and nobody else was rich enough to contribute much. In the East, on the other hand, there was a larger "middle class", who didn't have the ability to avoid paying taxes but were still worth taxing.

Also, the Eastern aristocracy had largely been created by Constantine and his successors, and came from a region where royal cults had a long history. In the West, on the other hand, the Senate preceded the institution of the Empire, and a sort of sentimental republicanism persisted even down to this time, with a lot of Senators accepting rule by an Emperor rather than enthusiastically supporting it. Hence they were much less predisposed to make sacrifices at the Emperor's command than the Easterners were.

Manpower etc. did become a problem as the time period went on, but this was originally a result of the Western Empire's structural weaknesses (outlined above), although once established it did set up a sort of vicious cycle. On paper, the Western Empire c. 400 was more than a match for any of the Germanic tribes, and even at the end of the Empire it ought to have been at least as strong as any one of them. The West wasn't doomed to fall from the moment the Empire was divided; it fell because of bad government and a lack of investment on the part of its leading citizens.

(The above is my summary of what Friell and Williams argued. I'm doing it from memory, so if anyone has access to the book itself, feel free to correct me.)
 
Also, some kind of polygamy would help, so that dynasties last longer.

Polygamy does increase the chances of having a son to inherit. It does nothing to guarantee that son is competent. Polygamy also increases the chance of civil war between brothers.
 
Like Arbiter said above, all empires fall eventually. So IMHO the only option to "save" some sort of Roman Empire until the present day is to have a cyclical process of fall and rebirth on the Chinese or Egyptian model. For that to be possible, you need to have a "Son of Heaven" at the helm, i.e. an Emperor that is even more divinely sanctioned than the Emperors of the early Empire. For that to be possible, no monotheism can be allowed to have much sway. So no Christianity and no Islam on a significan scale.

Out of curiousity, what's your take on Gibbons' assessment of the impact of Christianity?
 
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