City walls of Paris

The city limits of Paris, from the 4th century to present
  Gallo-Roman wall
  First medieval wall
  Wall of Louis XIII
  Today

The city walls of Paris (French: enceintes de Paris or murs de Paris) refers to the city walls that surrounded Paris, as it grew from ancient times until the 20th century, built primarily to defend the city but also for administrative reasons. Several successive city walls were built over the centuries, either adding to existing walls or replacing demolished ones, through 1846, when construction of the Thiers wall was completed.