| 2 Oct 1890 | Julius Henry "Groucho" Marx is born |
| 1909 | The Three Nightingales: Groucho and Gummo are joined by Mabel O'Donell for this singing trio managed by Minnie Marx |
| Jan 1910 | Harpo joins The Three Nightingales to form The Four Nightingales |
| Feb 1910 | When joined by Minnie Marx and aunt Hannah Schickler The Four Nightingales become The Six Mascots |
| 1912 | Fun in Hi Skule is the first musical sketch of the Brothers.
This half-hour 'school act' features the four brothers, Paul Yates and others |
| 1913 | Mr.Groucho marx biography comedians Groucho marx biography comediansGroucho marx biography comedians wikipediaMarx brothers biographyGroucho marx wifeGroucho marx political viewsGreen's Reception is a followup to Fun in Hi Skule |
| 1914 | Home Again is developed from the second half of Mr. Green's Reception |
| 1918 | In The Cinderella Girl Zeppo replaces Gummo.
This musical comedy is written by Jo Swerling with music by Gus Kahn |
| 4 Feb 1920 | Groucho marries Ruth Johnson |
| 1921 | On the Mezzanine Floor (in England: On the Balcony) a musical revue written by Herma
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