Wait, how is that? Did the rise of Islam have something to do with Pippin and Alpaida getting together OTL?
Alpais was born about twenty years after the latest possible PoD (death of Muhammed in 632, and then people forgetting about him instead of making a religion). Charles was born 55 years after 632. That is heaps of time for even a little butterfly to get in the way and prevent his birth.
So does this mean the Visigoths and Franks de facto fall (or stay) under the religious influence of Constantinople, similar to how the Bulgars and Russians did later OTL? And if the Visigothic Kingdom does manage to hold together TTL, could they lay the groundwork for a later reunification with "Rome"?
The Franks at least never really cared about Constantinople. Rome, when they felt like it, but not really Constantinople.
Re the Visigoths, they probably won't stay together long enough to join the ERE (and I doubt they would go a quarter of the way to trying). They were a pretty ugly mess by 710 IOTL, otherwise the Muslims wouldn't have managed to crush them so quickly. Without a unifying force for Christendom (such as the Muslim threat), there wouldn't be any reason to join the ERE even if they could manage it.
I also certainly don't see the Lombards taking Rome at any point in this timeframe, considerinig they couldn't even take it from the severly weakened Exarchate of Ravenna in our timeline.
Luitprand, Aistulf and Desiderius all had the military capacity to take out the Papal guard, which was really only a token force. The only thing that stopped them was the threat of the Franks, who had the capacity to kick the Lombards in the teeth (see 774 campaign for a demonstration of this). Because the Karling line doesn't happen in this TL, and the Merovingians probably stay useless, the Lombards could have Rome if they wanted it enough.
I'd say a Charlemagne type ruler is quite unlikely though, as a more powerful Rome will have the military and economic power to challenge any Imperial Pretender's claims, not to mention that Constantinople would have a better hold on Italy in this timeline which would completely butterfly any sort of Papal Coronation.
Charlemagne got lucky. His brother's death, His father's death when he was young (well, 21 is young for a king), Iconoclasm making a nuisance of itself, the fact that the Vikings and Saxons were being quiet (at least outside of their own territory), the fact that Irene was a woman...
Without that chain of events, not to mention that Charlemagne was extremely able in his own right... forget it.
Speaking of which, I don't think we got around to how Arabia would be affected in the short term by our PoD.
Arabia in 650 would be like Arabia in 550 - a bunch of tribes wandering around the desert doing pretty much nothing to impact the world in a major way.
- BNC