The Anti-Slavery Society Convention, 1840, by Benjamin Robert Haydon (died 1846), given to the National Portrait Gallery… https://www.rawpixel.com/image/7666291/image-art-vintage-public-domainFree Image from public domain licenseThe Prince Regent presenting to political ministers the expected baby of Princess Charlotte and Prince Leopold, who urinates… https://www.rawpixel.com/image/13961995/image-dog-cartoon-faceFree Image from public domain license