There is a portrait on page 445 of Lightbown of Caterina Cornaro by Gentile Bellini. It says it's Venetian, from 1500. She is wearing a coronet that would work very well in the SCA. I've been planning to take digital photos of some of these pages, because the images aren't online anywhere and the book is unobtainable. I don't think posting them on the Internet is a good idea, though. Send me an email with your email address and I will send you the photo. This will help kick me in the butt to actually take the photo. :-)