High Quality Content by WIKIPEDIA articles! Most of the Paris we see today is a result of a nineteenth-century renovation, but its boulevards and arrondissements were but a new grid bisecting quarters built by centuries of Parisian habit; as a result of this, Paris has many quarters that are not necessarily mentioned on any administrative map. Although Paris's origins are in its Left Bank, Parisians began to move to the newly-dried swampland of the Right bank around the 10th century, leaving the Left Bank to ecclesiastical and scholastic institutions. Commerce was at its highest around the Châtelet bridge guardhouse and Place de Grève port, a market quarter that would later become Les Halles, artisans tended to keep to the east of the city, and the more noble residences and shops were always near the royal palaces. Although many are split between several arrondissements, most of these tendencies still hold true in Paris today.