Marriage alliance between Charlemagne and Offa of Mercia

From Wikipedia on Offa:

In about 789, or shortly before, Charlemagne proposed that his son Charles marry one of Offa's daughters, most likely Ælfflæd. Offa countered with a request that his son Ecgfrith should also marry Charlemagne's daughter Bertha: Charlemagne was outraged by the request, and broke off contact with Britain, forbidding English ships from landing in his ports. Alcuin's letters make it clear that by the end of 790 the dispute was still not resolved, and that Alcuin was hoping to be sent to help make peace. In the end diplomatic relations were restored, at least partly by the agency of Gervold, the abbot of St Wandrille.

Suppose this marriage pact goes through. Does this change anything with regard to European history? Does Charlemagne start paying attention to Britain more?
 
Well if he managed to get territory in England the grain and riches he could obtain could very well give the momentum to rebuild the Western Roman Empire.
 
Well if he managed to get territory in England the grain and riches he could obtain could very well give the momentum to rebuild the Western Roman Empire.

I don't think that anyone thought seriously about Frankish rule over parts of England. That would have been highly unlikely and rather impractical.
Plus, what do you envisage as rebuilt WRE? Charlemagne using English ressources (and the most relavant would be troops, I guess, not victuals) to conquer Arab Spain? North Africa? South Italy?

There are three changes that seem to have the biggest possibilities:

After 800, the hegemonic king of England accepts Charlemagne as his imperial overlord, without giving up any real power on the island. This precedent might lead to whoever holds the imperial title trying to meddle in English affairs whenever a succession crisis occurs there.

A strong Frankish-Mercian alliance might change the whole history of England. It is impossible to predict the highly personalized politics of the time, where the birth or death of princes can change the fate of nations. But one can imagine a TL where the Ecgfrith-Bertha line stays on the throne and where a midlands-based king rules over Wessex and the SE., perhaps even with (limited) Frankish military support there. As in - "the biggest political and military goal of the Mercian kings was the secure possession of London and Kent, so his Frankish allies could land securely in the South West and help Mercia in its campaigns against East Anglia, Sussex and Wessex."

And if Anglosaxon nobles show presence in the Carolingian court, they might play a much bigger role as appointed counts and officials in conquered Saxony. I know that the insular and the continental Saxon language and customs were not identical by 800, but a Anglosaxon would probably understand his new Saxon subjects better than an, say, Aquitanian.
 
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