Ah, coming from the good old british revisionist

I got something too, something that nobody wants to depict:

https://penelope.uchicago.edu/encyclopaedia_romana/britannia...

Possibly you know this, but there actually was a show about the Roman invasion of Britannia that was on only a couple years ago: https://www.imdb.com/title/tt5932548/. Not vouching for the quality or anything. I only watched the first couple episodes and they were pretty ridiculous, also explicitly magical, not seeming to be aiming for realism.