Within it for how long?
It depends on what's in the territory, obviously. If Rome develops silver mines and can harness Germanic manpower, it will be kept. If it can't, then it goes the way of the Roman occupation of Scotland.
Within it for how long?
It depends on what's in the territory, obviously. If Rome develops silver mines and can harness Germanic manpower, it will be kept. If it can't, then it goes the way of the Roman occupation of Scotland.
The religious repercussions will likely be even more substantial. The POD is early enough to butterfly away Christianity completely. In 9 CE Jesus was still a teenager, likely working with Joseph on one of the many construction sites in the newly founded capital of Galilee Tiberias. Maybe, due to butterflies, he is killed there in a workplace accident before he ever starts to preach, maybe he lives the obscure life of an average jewish craftsman in 1st century roman occupied Galilee, maybe he still goes on to preach and assamble a group of followers, but a different roman prefect either pardons him or has his disciples crucified alongside him and christianity remains known as little more than a footnote in history, a minor jewish sect in the second half of the 8th century AUC.This could have some interesting religious repercussions.
If the limes settles on the Elbe or even the Weser, then the Franks, as we know them, probably never come into existence, or even if they do they'll be in a different location than OTL. So Clovis almost certainly never gets born. Come the Barbarian invasions (perhaps a century earlier or later than OTL), and whichever German King gets Gaul may adopt Arianism [1] rather than Catholicism.
The east too could be affected. In the mid 4C, the Emperors were favouring Arianism, until Julian came to the Purple. And on Julian's death, his successors opted for Catholicism. If he and they are butterflied away, the Empire might have stayed Arian a lot longer. This could be a big deal, as Arian views on the nature of Jesus Christ - they saw him as a sort of Demigod rather than an equal partner in a Trinity - were not too far removed from those of Islam later. If the Mediterranean world stays Arian for a longer time, could the Arabs be converted?
[1]Probably under another name. All this will change Roman history enough that Arius himself is probably never born. However, the extent to which his heresy caught on - even being adopted by several Emperors - suggests that such ideas were "in the air" and that had he not been around to formulate it, some other theologian would have done so.
The religious repercussions will likely be even more substantial. The POD is early enough to butterfly away Christianity completely. In 9 CE Jesus was still a teenager, likely working with Joseph on one of the many construction sites in the newly founded capital of Galilee Tiberias. Maybe, due to butterflies, he is killed there in a workplace accident before he ever starts to preach, maybe he lives the obscure life of an average jewish craftsman in 1st century roman occupied Galilee, maybe he still goes on to preach and assamble a group of followers, but a different roman prefect either pardons him or has his disciples crucified alongside him and christianity remains known as little more than a footnote in history, a minor jewish sect in the second half of the 8th century AUC.