The quartier Mazarin is a district in the centre of Aix-en-Provence, directly to the south of the cours Mirabeau, the principal boulevard in Aix. On the initiative of Archbishop Michel Mazarin, brother of the Cardinal Jules Mazarin and Archbishop of Aix from 1645-8 and later himself a cardinal, city plans were devised in 1646 by Jean Lombard, director of public works, to extend the city ramparts to the south, incorporating land owned by the Archbishopric of Aix and by the Order of Saint-Jean-de-Malte. Following a grid plan of streets, the quartier contains a large number of hôtels particuliers originally built for the nobility and wealthy merchant class.