There have been five lions playing the role of “Leo The Lion”. The first was Slats, who graced the openings of MGM’s silent films from 1924 to 1928. The next lion, Jackie, was the first MGM lion whose roar was heard by the audience. Though the movies were silent, Jackie’s famous growl-roar-growl sequence was played over the phonograph as the logo appeared on screen. He was also the first lion to appear in Technicolor in 1932.
The third lion and probably most famous was Tanner (though at the time Jackie was still used concurrently for MGM’s black and white films). After a brief use of an unnamed (and very mane-y) fourth lion, MGM settled on Leo, which the studio has used since 1957.
The company motto “Ars Gratia Artis” means “Art for Art’s Sake.”