Two knights in armour shaking hands on horseback, with coats of arms on their horse covers identifying them as Holy Roman Emperor Charles V and his brother Ferdinand, 16th century. Stone carving dated 1527. Chromolithograph from Hefner-Alteneck's "Costumes, Artworks and Appliances from the Middle Ages to the 17th Century," Frankfurt, 1889. Illustration by Dr. Jakob Heinrich von Hefner-Alteneck, lithographed by C. Regnier. Dr. Hefner-Alteneck (1811 - 1903) was a German museum curator, archaeologist, art historian, illustrator and etcher.