On 20th June 1789, the third estate assembled in the hall of an indoor tennis court in the grounds of Versailles. The third estate declared themselves a National Assembly and swore not to disperse till they had drafted a Constitution. They wanted to introduce a Constitution for France which would limit the powers of the monarch. Mirabeau and Abbe Sieyes led the movement. Mirabeau brought out a journal and delivered powerful speeches to inspire the crowd assembled at Versailles. Although he was born in a noble family but was convinced of the need to go away with a society of feudal privilege. In this way, Mirabeau contributed to the formation of the National Assembly.