alternatehistory.com

http://en.wikipedia.org/wiki/Louis_the_German
Louis the German was probably the most successful of all of Charlemagne's grandson's and his descendants nearly reunited the Carologinian Empire. But for his son Charles III heirless death, the empire might have had a change to remain united.
http://en.wikipedia.org/wiki/Charles_the_Fat

Assuming his has a surviving legitimate heir or the church recognizes his illegitimate son as his heir, what happens to Europe and the Empire? Can constant division of lands be overcome in later generations or will the Empire be doomed at a later date?
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