Playwright Carlos Wupperman was killed in the Rhineland in 1919 while on duty there with the Army of Occupation. Wupperman had only one play produced on Broadway. The Triumph of X opened at the Comedy Theater in New York City on August 24, 1921, but ran only 30 performances.

The production is notable for several reasons; besides starring his brother, Frank Morgan [best known for playing five separate characters, including the title character, in The Wizard of Oz (1939)], the play's female lead was Helen Menken (who would marry Humphrey Bogart in 1926), and in his first Broadway outing, character actor Robert Keith, father of actor Brian Keith and one-time husband of Theater Guild actress Peg Entwistle, who committed suicide by jumping from the Hollywood Sign in 1932.