The Tennis Court Oath (in French, Serment du jeu de Paume) was a commitment to a national constitution and representative government, taken by delegates at the Estates-General at Versailles. It has become one of the most iconic scenes of the French Revolution.
Summary
On the morning of June 20th 1789, deputies in the newly formed National Assembly gathered to enter the meeting hall at the Hôtel des Menus-Plaisirs at Versailles, only to find the doors locked and guarded by royal troops.
Interpreting this as a hostile move by King Louis XVI and his ministers, the National Assembly proceeded to the nearest available space, one of Versailles’ indoor tennis courts.