AHC: Hohenstaufen England

Not easy- Frederick II's third wife was Isabella Plantagenet (daughter of King John), but even if they had a surviving son he'd be behind his uncles Henry III and Richard of Cornwall (plus their descendants) and his aunt Queen Joan of Scotland (who had no issue).

Even if Henry, Richard and Joan, and all of their progeny, died off and left Isabella as theoretical heir the aristocracy might be more inclined to support Simon de Montfort as the husband of John's youngest daughter Eleanor rather than Isabella and her hypothetical German son (Henry/Heinrich because that's a name from both Hohenstaufen and Plantagenet families?).

I think, in general Frederick would be more busy in his struggles with the Pope and his crusades and securing his son Conrad as King of Jerusalem and trying to centralize/reform stuff (he was a busy dude). You'd also think *Henry would be more focused on defending the Hohenstaufen patrimony in Italy/HRE than having a run at far off England- Conrad, in a similar-ish position, never set foot in Jerusalem. I also don't see the English wanting to be subjugated to the HRE.

Alternatively you could maybe work a scenario where Richard Earl of Cornwall/King of the Romans marries a daughter to one of the surviving Hohenstaufen (Conradin?), but that's unlikely because Richard's rule over the Germans was pretty ephemeral and hardly strong enough to be setting down roots by marrying daughters to prominent German magnates. The Hohenstaufen would also perhaps be leery of intermarriage with the random English dude who had wandered into Germany and took their traditional title.

Random query, did Richard swear homage/vassalage to Henry VI when he was ransomed or is my memory fuzzy? If he did then England was kinda-sorta theoretically a Hohenstaufen vassal.
 
Challenge: Have the Hohenstaufens become Kings of England.

It's easier to have a Salian become king of England through the marriage of emperor Henry V and Mathilda.

And after all, the Hohenstaufen were the heirs of the Salians since Frederick one-eyed (father of emperor Frederick I Barbarossa) and his brother emperor Conrad III were nephews of emperor Henry V and grandsons of emperor Henry IV.
 
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