Robinet Testard was a 15th century French bookpainter - he did some marvelous work, and the pictures just invite to dream!
One of my favourites is the girl with the unicorn sitting next to a pond:
What is from the Russian National Library in St. Petersburg
Most of the pictures are from the French National Library, shortly BNF, and that's the link to them:BNF Bibliotheque national francaise
The ones without the BNF-Sig are from the Russian National library in St. Petersburg