Saiyuki chapter 55 – question about the stained glass window?

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In this picture, we see two people painted on the stained glass window behind the shadowed figure (Nii), presumably saints. I’m particularly curious about the one holding a book – is it any saint in particular, or is it just there to make it look pretty? Knowing Minekura, I wouldn’t be surprised if it was supposed to be a certain saint, but not knowing much about saints, I don’t have the slightest idea if it is or isn’t. If anyone has any idea at all about what possible saints it could be meant to represent, that would be great. =)