Reddit mentions of Empire of Magic: Medieval Romance and the Politics of Cultural Fantasy

Most of the literary analysis I’ve seen focuses on race more broadly. Geraldine Heng has a lot of good material...her book Empire of Magic is what I used as an entry point to get into the subject, but it’s not an easy read. Her articles should all be available for free here. Black Legacies by Lynn T Ramey is also a good introductory book and has a section on mixed-race identity. For non-academic resources, the MedievalPOC blog and Elodie Underglass’ blog post “Black Knights, Green Knights, Knights of Color All Around: Race and the Round Table” are both very good.

If you want to go straight to reading the literature itself, Parzival and Moriaen have mixed characters, and Chaucer’s Man of Law’s Tale deals with mixed marriages.

There are lots of more resources out there, but this should be more than enough for an introduction :)