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1823 - Rugby began organized play at the Rugby Boys School of London. At the same time students at Princeton were playing a similar game called "ballown"
1867 - Princeton and Rutgers both had developed their own rules of the game.
1869 - Nov 6 first game between Rutgers and Princeton. Rutgers won 6 goals to 4.
1873 - Columbia, Rutgers, Princeton, and Yale met in New York City to formulate the first intercollegiate football rules.
1895 - First professional football game
1920 - American Professional Football Association founded
1922 - Renamed National Football League