The Tennis Court Oath was a political covenant signed by members from the Third Estate on June 20, 1789, during the French Revolution, by which they agreed not separate until a Constitution had been written and approved. Although it was an initiative of the Third Estate members, a majority of the representatives of the clergy soon joined them in the Tennis Court Oath, as did 47 members of the nobility. This political commitment is so called, since the National Assembly, formed by Third Estate members after the Estates General had failed, moved their deliberations to an indoor real tennis court, in which the members swore the Tennis Court Oath. The reason for them to move there was that the king Louis XVI had closed the Estates General Hall (Salle des États).

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