Premise: John Gilbert (born John Cecil Pringle; July 10, 1899 – January 9, 1936) was an American actor, screenwriter and director. He rose to fame during the silent film era and became a popular leading man known as "The Great Lover". At the height of his career, Gilbert rivaled Rudolph Valentino, another silent film era leading man, as a box office draw.
Hypothesis: Actor John Gilbert rose to fame during the first world war.