I haven't read many royal books BUT I do have a copy of Tea Fit for a Queen: Recipes & Drinks for Afternoon Tea. Yes, it's a cook book but it's really aesthetically pleasing. Though, I haven't actually made anything from it yet since some items are hard to find here and the measurements confuse me...
It also has little snipets about different royal residences and then recipes that are linked to them. It's really good actually. There's also two (I think) recipes that are linked to Mary, Queen of Scots. So, bonus points for that!
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