Answer:
The Tennis Court Oath was taken in Versailles on June 20, 1789 by representatives of the third estate and their sympathizers from the lower clergy and nobility - on the initiative of Jean-Joseph Mounier. In addition to Joseph Martin-Dauch, 576 delegates took an oath not to break up before they had given the Kingdom a National Assembly and a new constitution. It was one of the major events during the French Revolution, in which the revolutionaries agreed to start the demonstrations.