The first French national assembly gathered without royal authorization on 20 June 1789 in the tennis court of the Palace of Versailles. the first step of the French Revolution, and in May 1793 moved to the empty theater of the Tuileries Palace in Paris. The aristocracy fled into exile, and the Palais Bourbon and Hôtel de Lassay, like the Luxembourg Palace, Élysée Palace and Hôtel Matignon were nationalized, and used for government functions. The stables of the Palais became the headquarters of the administration of military transport, while the Palais Bourbon became in 1794 the Central School of Public Works, which later became, under Napoleon, the École Polytechnique, the famous military engineering school.