The Luxembourg Palace is located at 15 Rue de Vaugirard in the 6th arrondissement of Paris. It was originally built (1615–1645) to the designs of the French architect Salomon de Brosse to be the royal residence of the regent Marie de' Medici, mother of Louis XIII of France. After the Revolution it was refashioned (1799–1805) by Jean Chalgrin into a legislative building and subsequently greatly enlarged and remodeled (1835–1856) by Alphonse de Gisors. Since 1958 it has been the seat of the Senate of the Fifth Republic.