Mohammed MichelBaudier - Public domain portrait engraving

Portrait of Mohammed from Michel Baudier's Histoire générale de la religion des turcs (Paris, 1625). It was sold at auction by Sotheby's in 2002. The same image was incorporated into the cover of issue #2195 of the French magazine Le Nouvel Observateur. (Hat tip: Kilgore Trout, and Raafat.)