On: From Æthelflæd to Ælfthryth: The Idea of Queenship...

[partomniscient]

Likewise, The Last Kingdom TV show covers these characters probably even more - Æthelflæd is in all 5 seasons [1] (although season 5 isn't out yet), and there's a lot of focus on Mercia.

[1] https://the-last-kingdom.fandom.com/wiki/%C3%86thelfl%C3%A6d

Edit: Should have hit refresh rather than browse tabs opened a while ago...err, I agree with dave333

[cmrdporcupine → partomniscient]

Unfortunately that show has some odd changes to history done for the purpose of entertainment. Particularly on her character, and the history of Mercia and its relationships.

[partomniscient → cmrdporcupine]

Yeah, there's all sorts of stuff they've apparently moved around, even from the books it was based on, which themselves were 'historical fiction'.

[staticautomatic → partomniscient]

Many of the plots are true, but of different characters or different locations.