It's a big ol' thing: wowser !

https://www.amazon.com/Escanor-roman-arthurien-si%C3%A8cles-French-ebook/dp/B081HGQV9Z/ref=sr_1_1

I'm about 1/3 way on Fergus of Galloway by Guillaume le Clerc, only 'recently' (compared to other mostly French Arthurian content) in English. Translated, with introduction and notes, by D. D. R. Owen.
Sadly the paragraphing is poor (no breaks when speaker or peson doing action changes). Tempted to fix it as it's anebook (one of the more expensive ones I've bought at about €14)
Main old non-French is some in the Mabinogion collection by Lady Guest.