I do enjoy researching the middle ages for ‘The Raven’s Wing’. It turns up delights like the Urine Wheel, used by medieval uromancers to analyse the look, smell & taste (yes, you heard) of a patient’s piss in order to ascertain their health and, in some cases, predict their future. You can bet that this will make an appearance in the book.
And then I discover that we can now buy Urine Wheel earrings. What a place of wonder is this modern world.