Le Serment du Jeu de paume Jacques-Louis David, 1791. The Tennis Court Oath of June 1789. This marked the founding event of the French Revolution. On 20 June 1789, the members of the French Estates-General for the Third Estate, who had begun to call themselves the National Assembly, took the Tennis Court Oath (French: Serment du Jeu de Paume), vowing "not to separate, and to reassemble wherever circumstances require, until the constitution of the kingdom is established. On the unfinished canvas,