In Book 3 Canto XI, Britomart has a brief run in with a giant, Ollyphant, and the Norton mentions that Ollyphant and his sister (also a giant) had an incestuous relationship and that this was Bad. But it made me curious about the incest taboo during the Renaissance period—is it about the same as today, or are there any significant differences in terms of how we might understand it?  (Strong feeling that it’s going to be the latter.)

I did do a cursory Google search of this and there didn’t seem to be any smaller articles on the subjects—only books.

So I guess I am wondering if anyone (coughProfessorKitchcough) might have an answer to this off the top of their heads?