Thanks to an unfollowable stream on Twitter, I came upon the website of Joshua Nudell, an historian with an interest in ancient Greek breads. A post of his, translating from Athenaeus’s Deipnosophistae, refers in passing to "the loaf from rye (or spelt)". That's strange. So I left a comment on the post, as follows:
I don't know Ancient Greek, but I do know some ancient and modern cereals, so I am hoping you can elaborate on this. Does the list mean two different loaves, one of rye and one of spelt? Or does it mean that rye is sometimes known as spelt, which would be a very interesting reading indeed.
This could be interesting.