What if the Frankish Empire was split differently than in OTL
What if Charles the Bald received Lower and Upper "Lotharingen"*, while Lothair receive Aquitaine instead. I know we need a earlier POD, maybe one where Charles is made king in either Upper or Lower "Lotharingen" before the split instead of Aquitaine.
Beside this their territories is as in OTL
*Will likely be known under a different name ITTL, maybe Karlingen.